Hostas are known for being pest and disease resistant. Gardeners may buy and exchange hostas without fear of bringing anything hazardous into their garden, save from foliar nematodes. Regrettably, this is no longer the case. Not only are foliar nematodes out of control, but a disease has suddenly spread like wildfire through the market.
A few “fortunate” hosta farmers began discovering what appeared to be new, fascinating sports of normally common hostas about 1998-2000. Blue or green colored dots or blotches appeared throughout the gold portion of the leaf in these “sports.” Some felt it was lovely, while others found it troubling. When these strangely marked plants began showing up in large quantities at several of the big chain stores and nurseries over the next couple of years, a few people grew very worried.
The reason of the mottled colour was revealed by Dr. Ben Lockhart of the University of Minnesota: Hosta Virus X. (HVX).
Although it is uncertain where Hosta Virus X originated, it is clear that it has quickly spread to pandemic proportions.
Symptoms of Hosta Virus X
Because Hosta Virus X affects different hosta cultivars in diverse ways, a definitive symptom description is unattainable.
Blue or green marks on a light-colored leaf are the most common visual sign.
The marks frequently follow the veins of the leaves and flow into the surrounding tissue, giving the plant a mottled look.
Dried, dark patches and twisted, distorted leaves are less typical symptoms.
On dark, solid-colored leaves, off-colored mottling may be difficult to identify.
Lighter colored mottling can be seen along the veins of some green tissue, but it is rarely as noticeable as the marks on gold tissue.
However, some dark-colored Hostas look to have had bleach splashed on them.
I’ve discovered that the texture of the leaf can be just as, if not more, indicative of illness than the color.
HVX-infected plants’ leaf tissue is generally lumpy, puckered, and of a different thickness or texture than healthy plants’.
Patches or streaks of sunken, wrinkled, or collapsed tissue can be seen on leaves.
These are subtle indications that require a keen eye and a lot of practice to spot.
On hostas with highly puckered leaves, spotting these textures can be practically impossible.
To make matters worse, some hosta cultivars do not appear to show any obvious indications of HVX infection, and symptoms might take up to a year to appear after a plant has been infected.
Method of Infection
The most obvious way for Hosta Virus X to propagate is by mechanically transferring sap from an infected plant to another plant. Regrettably, this is easier to accomplish than one may believe. The disease can be transferred through contaminated tools and hands. Infected sap can be transferred to healthy hostas by cutting roots while digging and pruning off diseased leaves and spent flower scapes. Insects, slugs, and other animals such as rabbits and deer, according to researchers, cannot spread the virus.
This outbreak is not caused by tissue culture.
Although HVX can survive tissue culture, most tissue culture labs check their stock plants for several viruses before putting them in TC.
Several large wholesale farmers in Holland, as well as a few growers in the United States, are the main sources of the Hosta Virus X outbreak.
The virus is disseminated during the harvesting procedure.
Many overseas producers power wash the plants in preparation for shipment, in addition to digging and cutting.
Some of the outer layer of tissue is actually taken away during this process, exposing sap that can infect neighboring plants through the stripped tissue.
We’re merely scratching the surface of how Hosta Virus X works.
While mechanical infection is the most dangerous, researchers may find alternative ways for HVX to spread.
Plant viruses have no cure, and having virus-infected hostas in our gardens is dangerous.
Although one study suggested that HVX might be transferred by seed, Dr. Lockhart stated at the 2010 American Hosta Society Convention that the study was unreliable.
There have been no confirmed occurrences of Hosta Virus X being passed on to seedlings via pollen or seed that I am aware of.
Other viruses closely related to HVX have been shown not to spread via seed or pollen, so HVX is expected to follow suit.
Infection is Dependent on Season
Dr. Lockhart made a key note talk on the current findings of his AHS-sponsored research at the 2010 American Hosta Society Convention. Hosta Virus X is most easily transferred in the spring, when hostas are actively growing, and difficult, if not impossible, to transmit after a hosta blossoms, according to the researchers.
According to early study, some hosta types were resistant to infection by Hosta Virus X.
Instead, it appears that these “resistant” cultivars were never exposed to HVX when they were vulnerable to infection.
So, what does this imply for gardeners and nursery operators?
According to this study, the safest season to dig and divide plants to prevent HVX spread is late summer and fall.
I’m not suggesting, however, that it’s okay to overlook basic tool disinfection when working with plants in the fall!
Only that autumn division might be one additional safeguard we can use to keep our gardens safe.
Preventing Hosta Virus X from Spreading
The easiest approach to avoid infecting your collection with Hosta Virus X is to avoid growing affected plants. Plants with unusual spotted or mottled patterns should be avoided at all costs. However, not all infected plants show obvious symptoms, so if one plant in a group develops symptoms, do not buy other plants in the same group that appear to be healthy. If one has it, it’s extremely likely that some, if not all, of the others do as well. Any plants purchased in bulk from large wholesalers should be treated with caution. Most hostas sold in “big box” stores fall into this category. Keep an eye out for signs of HVX, don’t cut them, and toss them out if you notice any suspicious symptoms.
Although a decontamination regimen for equipment has yet to be created, always clean your instruments between each plant before dividing or cutting it.
Sanitation options include straight bleach, rubbing alcohol, and hospital grade Lysol combined according to directions.
Rather than dipping, it is recommended to carefully wipe clean instruments.
Susceptible Varieties
Hosta Virus X has been found in the following hosta cultivars. The plants used in the study come from a variety of producers and collectors. This does not imply that all plants of these types are infected with HVX; rather, it indicates that some plants of these varieties have been infected and disseminated in the market. The infected variety ‘Gold Standard’ is by far the most frequent. Early study revealed that some hosta cultivars were resistant to Hosta Virus X infection, but it’s safest to presume that all hostas are susceptible.
How do I know if my hosta has a virus?
What exactly is the Hosta virus X? Hosta virus X (HVX) is a viral disease that affects numerous hosta cultivars, including ‘Gold Standard,’ ‘Guacamole,’ ‘June,’ ‘Patriot,’Paul’s Glory,’Regal Splendor,’Sagae, Striptease,’So Sweet,’ and ‘Sum and Substance,’ among others. Since its discovery in 1996, a considerable number of hostas have been deliberately destroyed by nursery owners and gardeners in the United States to help prevent the spread of HVX.
How does Hosta virus X appear? HVX can infect any hosta cultivar, however some cultivars are more susceptible than others.
The type and degree of symptoms that emerge over time are determined by the cultivar. Symptoms do not appear in all hosta cultivars, and in some cultivars, symptoms do not appear until the second year of growth. Light or dark green discolorations along leaf veins, green and yellow mottling of leaf blades, puckering, circular discolored regions (called ringspots), and, in certain circumstances, wilting and tissue death can all be signs of the disease (necrosis). In gold-colored hosta varieties, symptoms are easier to spot than in green ones. Holding an infected leaf up to the light and comparing it to a healthy leaf can help identify symptoms when they are modest.
What is the origin of Hosta virus X? HVX is caused by the same-named plant virus (i.e., Hosta virus X). Only hostas are affected by this virus. HVX is usually introduced into a garden on newly transplanted, generally asymptomatic hostas. Garden equipment (e.g., pruners, shovels, knives, string edgers) and other items contaminated with the sap of infected plants can then be used to disseminate the virus from hosta to hosta. Many farmers are unaware that their hostas are infected, and as a result, HVX is spread from hosta to hosta in their garden or nursery without their knowledge.
How do I rescue a Hosta virus X-infected plant? Once a plant is infected with HVX, it will remain infected for the rest of its life. There are no chemical therapies that can be used to get rid of the infection. Although a grower’s first reaction is to remove infected leaves off a symptomatic plant, if contaminated pruners are then used to trim other plants, the virus can spread. The illness may only be eradicated by burning (where permitted by municipal regulation) or landfilling afflicted plants (and any accompanying plant debris). HVX should not be used to compost hostas.
How can I avoid future difficulties with Hosta virus X?
Prior to purchasing hostas, inspect them thoroughly and avoid any plants that show indications of HVX.
Keep in mind that even asymptomatic plants can transmit HVX, and symptoms may appear (or not) after you get your plants home.
Consider asking confirmation of HVX-free hostas from the seller when acquiring them (particularly if they are pricey).
For HVX testing, virus testing kits (from firms like Agdia, Inc.) are available and are quite affordable.
Note that hostas can be infected by a variety of other plant viruses, therefore a negative HVX test result does not imply that your plants are virus-free.
Whether or not your new hostas have been tested for HVX, keep them separate from other hostas in your yard for a few weeks and watch for symptoms as they adjust to their new surroundings.
Once your hostas have established themselves in your garden, try to avoid any wounds that could release sap and allow HVX to enter.
Wash your hands thoroughly with soap and water after working with individual hosta plants.
Decontaminate any items (e.g., pruners, shovels, knives, pots, work surfaces) that may have come into touch with hosta plants by soaking them in a solution of one of the following for at least one minute:
- In one gallon of water, combine 9 cups Carnation nonfat dry milk and 0.75 tablespoons polysorbate 20, or
- 2.5 tablespoons sodium lauryl sulfate (SLS) with 2.75 tablespoons Alconox (a sort of lab detergent) in one gallon of water, or
These ingredients are available for purchase on the internet. If you decide to use SLS, wear gloves and safety goggles and mix the solution in a well-ventilated environment because SLS is a recognized skin and eye irritant. Once the goods have been treated, rinse them well with enough water to remove any residue. In order to prevent the spread of HVX and other plant viruses, proper cleanliness is essential.
What happens if you overwater hostas?
Water is a favorite of Hostas. They get about 60 inches of rain per year in their natural habitat. Only Alabama, Arkansas, and Louisiana have that much precipitation on an annual basis. (The average annual rainfall in Delaware is less than 41 inches.) Because of the high rate of transpiration of hosta leaves, it is critical that we feed the extra water required for growth. During the whole growing season, a minimum of 1 inch of rain or supplementary water must be provided per week. Extra water above this requirement can assist in achieving maximal growth. The goal is to keep the soil at a steady moisture level. (Avoid alternating wet and dry extremes.) Watering in the morning is ideal since the hostas have all day to absorb the liquid. A lack of water can cause leaves to droop or even burn at the leaf tips. Hostas can go “drought dormant” and stop growing if there is a severe or prolonged absence of water. Although plenty of water will normally encourage these plants to re-grow, be sure that this re-growth does not occur too late for the hostas to go dormant before winter arrives.
The sort of fertilizer you use (chemical or organic, granular or liquid) is entirely up to you. Whatever type of Hosta you have, it will respond to fertilization. Many growers use a balanced N-P-K fertilizer like 10-10-10. Trace elements including chelated iron, magnesium, and calcium may also be useful. A soil test can also help you figure out if your soil has any inadequacies. Milorganite (6-2-0) treated sewage waste, soybean meal (8 percent N), animal dung, and even compost are all viable options. Milorganite has a strong odor and may include heavy metals; “fresh” animal manure has the ability to “burn” plants. Also, avoid fertilizing too late in the season. An early winter freeze can harm or even kill hosta plants that are actively growing.
Mulches aid in the retention of water in the soil by minimizing evaporative water loss, as well as reducing the quantity of weeds, water splashing, and providing a beautiful backdrop. Mulches include pine straw, cocoa mulch, pine bark nuggets, shredded hardwood mulch, shredded leaves, and even colorful stones. Mulches should be no more than 2-3 inches thick and kept at least 2-3 inches away from the petioles of hostas. There are a few disadvantages to using mulch. Slug and vole populations may increase in tandem with the likely increase in disease caused by the usage of organic mulches.
During the growth season, Hosta can be planted at any time. If you’re planting in hotter weather or in a brighter spot, you’ll need to give it plenty of water. Although hostas can be divided at any point during the growing season, the optimal times are before the plant starts to grow significantly in the spring and 4-6 weeks before the season ends.
This is a matter of personal preference. Some argue that the energy expended by the plant in creating seeds will be unavailable for future growth. If you remove the flower scapes before they open, you’ll miss out on the enormous, colorful, or fragrant flowers that some hostas have to offer. Even if the scapes are removed, some hostas, such as ‘Lemon Lime,’ may bloom again.
- Hostas prefer the shade, but some types can tolerate the sun, especially in temperate climes. The more sun your planting site receives, the more compact the plant will become, but it will also produce more flowers. The plant will grow larger and have more luxuriant foliage under more shade.
- Hostas require a consistently moist, humus-rich soil. Organic matter should be added to your planting beds.
- Blooming Season: Depending on the cultivar and your lighting conditions, hostas bloom at different times.
- After working with organic matter, make a hole twice the diameter of the plant ball. Remove any roots that are enclosing the root ball and transplant at the same depth as before. Fill up the gaps with the enriched dirt. To settle the soil, give it plenty of water. In the spring and throughout the season, fertilize with a time-release fertilizer. To promote water retention, apply a thin layer of bark mulch on top, but keep in mind that this may attract slugs. Although division isn’t strictly necessary, it can be done in the spring or fall.
- Combine hosta with astilbes, Alchemillas mollis, hardy Geraniums, and other shade perennials like Acontium, Pulmonaria, and Tricyrtis in a Hosta Pals arrangement.
Should you water hostas everyday?
Small or medium plants will require a good soak once a week once they have established themselves. Hostas tolerate drought but need moist, well-drained soil. Increase the watering frequency to three times per week if the weather is warm. Large hostas should be watered twice a week in the summer and daily in the winter, especially if they get a lot of sun.
Growing Hostas in pots necessitates more frequent watering. Because pots drain faster than gardens, giving the plant the slow sip it requires can be difficult. Water the pot every three days during the summer months. If the soil still appears to be too dry, it may need to be watered on a daily basis.
What do hostas look like when they get too much sun?
Despite its reputation for shade tolerance, most hosta cultivars thrive in a combination of morning sun and afternoon shade. Burned leaves develop from the margins inward after too much sun exposure. The leaves will be dark, dry, and papery in appearance. Colors fade when they are exposed to too much sunlight.
What’s wrong with my hostas?
The most frequent foliar disease of hostas is anthracnose. The cores of the spots frequently disappear, and the leaves become ragged and shredded. Because the disease thrives in warm, damp environments, keeping adequate plant spacing is critical for protection.
What does an overwatered hosta look like?
Hosta leaves can become yellow for a variety of reasons, and it’s critical that you figure out which one relates to your plant.
Hosta Leaves Turning Yellow from Scorch
When yellow hosta leaves suggest too much sun, it’s probably the easiest problem to fix. Hosta are shade-loving plants that thrive in partial or full shade. In fact, they’re a common sight in the shade garden. Yellow hosta leaves can be expected if grown in full sun. The leaves turn yellow and burn at the edges. Hosta scorch occurs when the leaves of a hosta plant become yellow as a result of too much sun.
If the plant is also cultivated in poor soil, the scorch will be significantly worse. The plant prefers moist soil that is rich in organic materials. The hosta leaves turn pale and burn when they are dried out in full light during a drought. You can provide temporary relief to the plant by watering thoroughly early in the day, but a better and more permanent option is to relocate the hosta to a shaded location with high organic matter soil.
Yellowing Leaves on Hosta Indicating Disease
When yellow hosta leaves signal disease, the treatment options become more limited. Petiole rot, caused by the fungus Sclerotium rolfsii var. delphinii, can produce yellowing leaves on hosta plants. Yellowing and browning of the lower leaf edges are the first signs of the disease. Your plant most likely has this disease if you notice brown, mushy decay with white fungal threads or fungal fruiting structures around the size of mustard seeds near the base of the petiole.
Do hostas like sun or shade?
A. Hostas are low-maintenance plants with a wide variety of types to pick from. Even though they are shade-tolerant, most of them will not survive in deep shadow. When given some sun, such as early sun with afternoon shade, many hostas become more strong and show their best colors. The sun is less bright in the morning than it is in the early afternoon. It will most likely be OK in the late afternoon sun.
How often should you water hostas?
Hostas are perennial plants with beautiful foliage that bloom from spring through frost. They’re simple to grow, require little upkeep, and can thrive for a long time. They will grow in size and beauty each year. Hostas rarely, if ever, need to be divided, and look their best when left alone.
Hostas prefer partial shade but can endure very shady conditions. They require protection from the heat of the afternoon sun, with the exception of a few types. Hostas are shade-loving plants that should always be planted in an area that is shielded from the scorching afternoon heat for the greatest results. The best place to grow Hostas is in an area that gets some morning sun but is shaded by the middle of the day before it becomes too hot. The coloring of the leaves, especially the golden yellows, will be enhanced by the morning sun. The leaves will burn if they are exposed to too much sunlight. If you insist on planting Hostas in full sun, the most important thing to remember is to make sure they receive enough water to avoid leaf scald. Hostas are big drinkers, with huge leaves that absorb water quickly and necessitate a lot of it. Hostas that are rated sun tolerant do well in full sun if you can keep up with their water requirement. Mulch will also aid to maintain soil moisture and keep roots cool.
Hostas prefer a loose, well-drained soil, which is usually garden soil that has been supplemented with compost or soil conditioners. Dig a hole that is large enough to hold the current roots as well as future growth. When in doubt, dig 10-12 inches deep with a diameter of around 18 inches. Form a mound of earth in the center of the hole and distribute the roots over it, adjusting the height of the mound to ensure adequate planting depth. Roots that have become knotted must be untangled. Planting depth should be 1/2 to 1 inch from the top of the plant’s roots or crown. Plants should not be planted too deeply. The roots should be covered with soil, and the branching point of the individual leaves on the stem should be above ground. Amended dirt should be used to fill the hole to ground level. After the dirt has settled, check the planting depth and make sure the roots are covered. This is especially critical just after planting and during the first winter.
Keep the plant adequately hydrated. Hostas are frequently referred to as drought-tolerant plants. That is true to some extent, especially for established plants. Most hostas can survive with only a little additional watering and typical rainfall, but that doesn’t imply they’ll grow well. Watering your hostas is the finest thing you can do if you want them to develop healthily and have rich foliage. For part-shade hostas, we recommend 1 1/2 inch per week. Those who live in hotter climates will require more water.
Fertilizer should be applied in the spring through early summer, when the hostas are actively growing. For ongoing feeding, we recommend using a water-soluble fertilizer at half strength or as advised. We also don’t advocate fertilizing in the fall.
Mulch is a great technique to get the most out of your watering while also reducing weeds. It’s crucial not to mulch too deeply, especially near hostas. Mulch should be one to two inches thick, and it should be kept several inches away from the hosta crown and shoots. Mulching all the way up to the stems is bad for the hostas.
We recommend using a nice high quality nursery style potting mix if you wish to grow your Hostas in pots or containers.
The same mixture can be used to amend thick clay soils. This soil mixture is regarded as “It will be “soiless” and devoid of nutrients, hence it is critical to feed the plants on a regular basis. Because the soil mix is also taken into account “Because the soil is “sterile,” there are no microorganisms present to aid in the breakdown of any organic fertilizers you may add, thus we always add a shovel full of compost to the mix.
Damaged leaves and faded flower stems should be pruned. After the wasted blooms have stopped blooming, you can clip them off as deep down into the leaves as you can reach.
Allowing the seed to mature and self-sow is an option. You’ll get new baby plants, but keep in mind that they won’t grow from seed and will rarely resemble the hybrid mother plant.
Remove the old foliage in the fall, after the foliage has died back for the winter. We recommend removing hosta leaf in the fall, even if it can be left in place until spring. To aid in the prevention of pests and disease. Composting Hosta foliage is not recommended. Begin slug and snail control as soon as the hostas appear in the spring, if necessary.
How do I fix my hosta scorch?
How Do You Get Rid Of Hosta Scorch? (As Well As How To Avoid It)
- To treat hosta leaf scorch, hydrate them more frequently with plenty of water, provide as much shade as possible, and transplant them as soon as possible to a shaded, moist location.
- Allow enough water to wet the soil to its maximum depth and to a diameter of at least 2 feet.
Should I mist my hosta?
When it comes to growing hosta, the amount of water needed depends on the circumstances in the garden as well as the time of year. From winter to summer, the technique of watering a hosta plant will vary. Watering requirements for growing hostas increase during the hottest stages of the summer season and decline as the weather cools and the plants become dormant in the fall.
Hosta irrigation is necessary to guarantee that the plants grow to their full potential and remain healthy. These plants demand soil that is both well-draining and consistently moist at all times. This can be accomplished by employing soaker hoses or drip irrigation systems to water the plants on a weekly basis.
Watering a hosta deeply, as with many perennial plants, is essential – they require around an inch (2.5 cm) of water each week on average. Plants can develop a more robust root system that is better able to access water deep in the soil if they are watered on a weekly basis.