According to John Negus, a garden expert for Amateur Gardening, “the ideal potting compost for shrubby plants is one with a high concentration of loam, such as John Innes No. 3.” The RHS (opens in new tab) suggests combining two parts of John Innes No. 3 and one part peat-free multipurpose compost for hydrangeas. Use an ericaceous compost as an alternative if you are growing blue hydrangeas and want to maintain the vibrancy of their color.
Even the best multi-purpose composts, according to John, “only have adequate nutrients for four to six weeks of growth, and after this is expended, plants will need supplemental feeding, either with a liquid or by top-dressing with controlled-release fertilizer.” From early summer to the end of flowering, feed with a liquid or top-dress in the spring.
John continues, “Loam-based composts retain moisture better than peat-based ones.” All potted plants, however, require constant watering because their roots are restricted and their compost is hidden by foliage, unless it rains heavily every day.
Need ericaceous compost for hydrangeas?
For hydrangeas to change from pink to blue, the soil must be acidic and contain salts of either aluminum or iron.
We all learned in chemistry classes in school that distilled water has a neutral pH of 7. However, in horticulture, a neutral pH is typically categorized as 6.5. Any soil with a pH below 6.5 is considered acidic, and any soil with a pH above 6.5 is considered alkaline. A pH testing kit can be used to check the pH of your soil, and Greenshutters Nurseries & Garden Centre has these on hand. The inexpensive pH meters that are available are often not precise, so I do not advise using them. Often, seeing surrounding gardens and the local plant life is a simpler approach. It’s likely that your soil is acidic if nearby Rhododendrons, Camellias, and Pieris are flourishing in the soil.
Peaty or sandy soils are typical of acidic soils. Clay soils are typically not highly acidic. Chalky soils have a high pH. By incorporating Irish moss peat or ericaceous compost, you can increase the acidity of your soil. Ericaceous compost has an acidic pH range of roughly 5.0 to 5.5, while regular multifunctional compost has a pH range of 6.0 to 6.5.
Irish moss peat is particularly useful for mulching since it has a pH of about 4.0, which is much too acidic for most plants to thrive in. However, when combined with neutral or alkaline soil, it lowers the pH of the soil. Once a year, mulch with Irish moss peat and let the worms to work the peat into the soil to maintain the acidity of the soil around a plant.
As an alternative, hydrangeas can be grown in containers. Although hydrangeas can thrive in both multifunctional and ericaceous compost, it is recommended to plant them in the latter if you want them to turn blue.
If your soil is deficient in aluminum or iron salts naturally, you can easily increase them by putting Hydrangea Colorant into the soil. People claim that adding rusty nails to the soil or compost will turn hydrangeas blue; however, as I have never tried it, I am unable to confirm if this is true or false. On the other hand, Hydrangea Colorant is a combination of Iron Salts and Aluminium Sulphate. When potting or planting, it can be added to the soil. For established plants, you can also dissolve the Hydrangea Colorant in water and give your hydrangeas a weekly drink during the growing season (March to September). Your light pink kinds will become blue if you do this, while your dark pink varieties will turn mauve-blue.
Grow your hydrangea in neutral or alkaline soil, though, if you want it to stay pink.
What kind of soil is ideal for hydrangea potting?
We automatically think of huge plants when we think of hydrangeas because of their enormous foliage and larger-than-life blooms. However, hydrangeas actually come in not one, not two, but three sizes!
Regardless of the size of your area, locate the ideal hydrangea. Even hydrangeas can be grown in a container.
1. Small Is Everything. Choose a hydrangea that will grow well in your restricted space. Dwarf variations are small yet mighty little beauty. To select the ideal dwarf hydrangea for you, browse our Hydrangea Variety Guide. Then, locate a location that has the appropriate level of illumination.
2. Bold, large, and riddled with holes To create a statement, choose a pot or repurpose a container. Ensure that it has drainage holes alone.
3. Gold Soil Solid. Choose a high-quality, organic potting soil for hydrangeas because they require well-draining soil to thrive. If it possesses Myco-toneTM mycorrhizae, which use 30% less water than conventional soils, it gets bonus points.
5. Decide on the necessities. Water hydrangeas in containers when the top inch of soil becomes dry or when the plant starts to wilt. Feed your hydrangeas once a year in June or July with an organic fertilizer for the finest hydrangea care. Feed your hydrangeas with Holly-tone if you want them to be blue.
Big blossoms in a small space! Just picture how beautiful your hydrangeas will appear at your Memorial Day party shimmering in the sun or glimmering in the moonlight at your summer garden gatherings!
Can you grow hydrangeas with regular compost?
An inadequate diet may make a Hydrangea’s style difficult. However, if you’re the type of gardener that favors natural techniques, you might be thinking whether all of those specialty fertilizers you see online are actually necessary. Can you use compost or other natural fertilizers to grow hydrangeas?
Yes, it is the answer. Compost, whether purchased or prepared at home, will help hydrangeas grow and thrive since it is nutrient-rich and improves soil drainage. Most Hydrangeas respond well to all-purpose compost, but ericaceous compost is preferable if you want your Mopheads or Lacecaps to produce blue flowers.
The fact that you can make compost in your own backyard is arguably its best feature. Simply gather the ideal mixture of kitchen and grass scraps and spread them out for your neighborhood worms and microorganisms. Your hydrangeas will receive a ton of nutritious yield from them.
Which acidic compost is the best?
The best compost to use for these acid-loving plants is ericaceous. For all kinds of acid-loving plants, our Westland Ericaceous Planting & Potting Mix is the best choice.
Do hydrangeas require specific types of soil?
In dappled shade that is neither very sunny nor overly dark, wet, well-drained soil is excellent for hydrangeas. Avoid sites that face south, especially if the soil is quite dry. Grow Hydrangea anomalasubsp. petiolaris, a climbing shrub, in an extremely shady area like a north-facing wall. Avoid planting in a frost pocket and plant away from strong winds in the spring since the tender new growth is vulnerable to frost damage.
Most soil types, including alkaline and acidic soil, are suitable for hydrangea growth. The color of some types’ flowers will vary depending on the pH of the soil. If the soil is acidic, some plants that typically produce pink flowers will instead produce blue ones.
When to plant hydrangeas
Hydrangeas grow best in the spring or fall when the soil is warm and moist. It is possible to plant in the summer, but you must monitor the soil’s moisture content.
How to plant hydrangeas
If your soil is thin, bulk it up with moisture-retaining organic matter before planting hydrangeas because they thrive in damp soil. A good hour or so before planting, thoroughly water the plant. A hydrangea should never be planted any deeper than it was in the pot. Well with water. After planting, add a layer of mulch. Leaf mould is preferable, but compost or well-rotted manure can also work. Throughout the plant’s first spring and summer, make sure it gets plenty of water.
Train climbing hydrangeas initially onto galvanized wires before planting. They have roots that attach to themselves, so after a season of growth, they will find their own way.
Watch this Gardeners’ World video to learn how to plant lacecap hydrangeas:
For hydrangeas, is Miracle Grow potting soil suitable?
Hydrangeas can tolerate full-day sun in the north. Add Miracle-Gro Garden Soil for Trees and Shrubs (in-ground) or Miracle-Gro Moisture Control Potting Mix to the soil to improve soil nutrition and drainage (containers).
How do you create hydrangea-friendly soil?
You can amend the soil with old manure or organic compost to provide rich, well-drained soil for your hydrangeas. Beneficial soil microbes are fed by organic matter, which improves and helps aerate the soil. Hydrangea roots have space to expand and can avoid root rot in well-drained soil. Before planting, cover the soil with 2 to 3 inches of organic matter in the spring and work it into the ground to a shovel’s depth. A 2-inch layer of mulch placed over the planting bed in the winter will increase the organic matter available to microorganisms, minimize soil erosion, and compact the soil.
What is required to make ericaceous compost?
You want to plant some flowers that need an ericaceous compost, but you have no idea what that word means or what it does. You’re surely not the only one who thinks so, though!
There are quite a few plants that, for a variety of important environmental reasons, can only flourish in this kind of compost. That is to say, you might be setting yourself up for failure if you try to produce Camellias, Blueberries, or Heather before first determining your soil type.
Nevertheless, don’t panic! We have all the details you require about ericaceous compost and how it will benefit particular plants in your yard.
What is ericaceous compost?
The plants that like to grow in it gave the soil type ericaceous, which is more acidic, its name. The Ericaceae family is the name given to them. This indicates that in order to support their growth, these acid-loving plants require a more acidic compost. Ericaceous plants are also referred to as lime-hating plants since they do not thrive in soils that are high in alkalinity.
Which plants need an ericaceous compost?
Rhododendrons, Azaleas, Camellias, Hydrangeas, Holly, Fern, Gardenia, Aster, Magnolia, Pachysandra, Lupine, Pieris, Viburnum, Bleeding Heart, Japanese Maple, Juniper, Blueberries, Raspberries, and Cranberries all require an ericaceous compost to aid in growth. There are many more, so be careful to investigate the kind of compost your plant need!
Why do these plants need ericaceous compost?
Ericaceous plants generate yellow leaves when grown in alkaline or lime soil. Chlorosis brought on by lime is the medical term for it. They typically die because they don’t grow or blossom well. The primary cause of this is that they require iron and other soil nutrients, which become insoluble or “locked up” in the soil when the pH is high and prevent the plants from absorbing them.
It could be simpler to cultivate these plants in pots or tubs if your soil is alkaline.
How should I care for and grow my ericaceous plants?
Consider growing your plants in a sizable pot or container that is loaded with ericaceous compost. The container is necessary so that you can later position your plants according to their demands in the appropriate region of your garden.
The majority of Ericaceous plants cannot be in direct sunlight because the exposure will cause their blossoms to turn brown. They are hence ideal for growing in shade.
Make sure to feed your plants with a sufficient fertilizer, and you’ll need a special ericaceous plant feed for the compost. A continuous release plant food is an alternative that can be applied once and nourish plants for six months.
Ericaceous plants also require constant watering, particularly in the summer. Therefore, be sure to water your plants once a week and mulch the soil well to keep the moisture in.
What are ericaceous plants?
Ericaceous plants are those that dislike growing in lime-rich soils. They also go by the names “acid lovers” or “lime haters.” This indicates that they won’t thrive in alkaline soils, which have high pH levels. Rhododendron, Camellia, Azalea, Pieris, summer-flowering heathers (calluna), and even Japanese maples (Acer) are examples of ericaceous plants. The same holds true for blueberries.
Ericaceous plants generate yellow leaves when grown in alkaline or limey soil. They experience poor growth and flowering and typically die as a result of this ailment, called as lime-induced chlorosis. The main cause of this is that high pH causes iron and other essential soil nutrients to become insoluble or “locked up” in the soil, making it impossible for plants to absorb them.
If your soil is alkaline, you can try excavating a sizable hole, covering it with plastic sheeting, poking some drainage holes through the plastic, and then filling it with ericaceous compost or soil devoid of lime. This carries some risk and rarely turns out nicely.
For growing plants that dislike lime, such as rhododendrons, azaleas, camellias, callunas, and other acid-loving plants, use ericaceous compost. The definition of plants belonging to the Ericaceae family is directly related to the meaning of the word “ericaceous.”
Grow ericaceous plants in containers
Ericaceous (lime-free) compost in large pots is the ideal environment for ericaceous plant growth. Ericaceous plants can be grown in pots, which also lets you choose where in the garden to put them. With the exception of Calluna and blueberries, the most of the mentioned plants prefer a location in light shade or out of direct sunshine, especially early morning sunlight, which can cause flower buds and blooms to wilt and fall off.
Good feeding is the key
Feeding the plants with a sufficient fertilizer is the other thing you need to do to ensure fantastic, healthy growth. Ericaceous plants actually perform significantly better when fed with a specific ericaceous plant feed, even though many plants can be fed with a general-purpose feed. These have all the essential nutrients required for lush, green foliage and an abundance of gorgeous blossoms.
Depending on your preference, this can be either a granular meal or a liquid feed. Because continuous release feeds can last up to 6 months from a single application, they are ideal for people who don’t have time to feed frequently. Those who enjoy the regularity of regular eating are better suited for liquid feeds.
It is crucial to feed Rhododendrons, Azaleas, and Camellias both in the spring and during the flower-bud-setting season, which runs from June to August.
Water ericaceous plants well, too
Due to their shallow roots, the majority of ericaceous plants, particularly rhododendrons, azaleas, camellias, and heathers, are vulnerable to drying out during protracted dry spells. Therefore, it is crucial to maintain soil or compost moisture. This is crucial throughout the summertime floral bud-setting season. At this point, bud set may not succeed if the soil or compost is allowed to dry up. In order to maintain moisture in the soil, mulch the soil thoroughly and water plants once a week when it’s dry.
Ericaceous plants and other acid lovers
Rhododendrons and other “ericaceous” plants must grow exclusively in ericaceous soil. In contrast to ericaceous plants, some are known to as “acid loving” and prefer to grow in an acidic environment. However, they may survive a little more alkaline soil.