The majority of spring-blooming bulbs, such as tulips, daffodils, and crocuses, are native to regions with harsh winters. In order for these bulbs to blossom successfully, you will need to “pre-chill” them if you live somewhere with moderate winters and little frosts (zones 8–11). The steps are listed below.
Warmer climate-adapted bulbs don’t need to be chilled first. These include Scilla peruviana, Freesia, Ranunculus, Anemone DeCaen, and Anemone St. Brigid. These winter-hardy bulbs can easily be planted in the fall for spring blossoms where they are located (zones 8–10).
The majority of bulbs that bloom in spring benefit from 10 to 14 weeks of freezing at 35 to 45F. These freezing temperatures cause a biochemical reaction in bulbs that “activates bloom production and starts root growth.” The bulbs will attempt to bloom without a cooling phase, but the flowers may be tiny and distorted. Bulbs can be pre-chilled for a longer period of time than advised, but not for any shorter period.
Start chilling the bulbs in mid- to late-October for best results, then plant them outside as soon as the chilling phase is over. As a result, the bulbs have more time to grow roots before concentrating on flowering. The bulbs will be prepared for planting in January or February if the chilling cycle is started in late fall.
As long as you don’t keep any fruit in the refrigerator while the bulbs are chilling, chilling your bulbs there is a simple choice. Ethylene gas released by ripening fruit will harm the developing blooms inside the bulbs. If you do decide to keep the bulbs in the fridge, make sure to put them in ventilated plastic bags to prevent drying out while they’re cooling.
Remove the bulbs from the refrigerator and plant them right away after they have chilled for the necessary period of time (see below). Select a planting place that will be shielded from the afternoon sun to prolong the bloom period. To assist retain moisture and keep the soil cool, you can cover the soil with a few inches of mulch after planting the bulbs.
The majority of pre-chilled bulbs will blossom 4 to 6 weeks after planting. Always treat pre-chilled bulbs like annuals.
Spring-blooming bulbs that should be pre-chilled at 35-45F
- 15 weeks Glory-of-the-Snow (Chionodoxa)
- 15 weeks for crocuses
- 12–15 weeks for hyacinths
- Muscari grape hyacinth: 12–15 weeks
- 16 weeks for daffodils
- 12–15 weeks for the Siberian squill (Scilla siberica).
- 10 to 14 weeks for tulips
- Galanthus (snowdrops): 12–15 weeks
- 13–15 weeks for iris reticulata
Do I need to keep my daffodil bulbs chilled?
Reader Trudy Stern sent me this query:
“Should I force my daffodils indoors in January or February, or should I keep them in the deep frost for a while? Tulips? Any unique advice? I am excited to enjoy some bulb beauty all winter long in my home.
I got in touch with Jeff Thompson, the horticulture director at the Buffalo and Erie County Botanical Gardens, because I believed this was a query that many readers could be interested in.
Before tulips, daffodils, and other spring bulbs bloom outdoors in Western New York, the Botanical Gardens puts on a grandiose Spring Flower Show each year. They know what they’re doing because they’ve forced hundreds of bulbs to blossom indoors for the display.
Although the bulbs require a chilly period, Thompson warned against freezing them. Place them in the fridge, not the freezer.
Put the bulbs in a top-opening opaque plastic bag, then place the bag in the crisper drawer. That will prevent your bulbs from drying out and shield them from the light that comes in through the door every time you open it.
You must have an opening in the bag so that air may circulate. According to Thompson, if the bulbs become wet, mildew and fungi may develop and cause the bulbs to die.
According to David Clark, a botanist and national garden speaker, a paper bag will also work when storing bulbs in the refrigerator this fall. However, if you have apples in your refrigerator, be careful not to store bulbs there. Ethylene gas, which is released by apples, can destroy the developing flower inside the bulb. View additional advice on how to plant spring bulbs in your garden here.
Plant the bulbs in pots, give them water, and then put the pots back in the refrigerator after the bulbs have been in there for a few weeks. While they are chilled, don’t water them once more.
“You’re attempting to deceive people into thinking they’ve experienced winter, Thompson said.
Remove the pots from the refrigerator, place them somewhere warm, provide them with light, and water them three to four weeks before you want the plants to grow and blossom.
Since November 25 some bulbs have been potted up and kept in the cooler by the Botanical Gardens personnel in anticipation of the March Spring Flower Show. The question’s author is hoping for them to blossom in January or February. You might be able to reduce your simulated winter and still obtain effects, Thompson added, if you haven’t already started chilling your bulbs.
Thompson mentioned that you might be able to find potted narcissus, hyacinths, and paperwhites right now. You don’t need to refrigerate those because the farmers have already chilled them.
Which bulbs need to be chilled?
Tulip planting in the spring is one of our favourite gardening rituals because it produces a stunning display of readily cut flowers for Easter, Mother’s Day, and other special occasions that call for elegant arrangements. The only spring flower that has to be chilled before growing is tulips, but there are others as well. The following is a list of every variety available at Plants for All Seasons that must chill before planting:
Should bulbs be chilled before planting?
Keep bulbs cool and dry as one of the fundamental storage guidelines to assist prevent sprouting before planting. How chilly? Don’t let your bulbs freeze. You shouldn’t store them in an unheated garage or shed if your location is still experiencing chilly evenings.
Make sure to keep your lightbulbs away from the furnace, out of direct sunshine, not on top of the refrigerator, and any other hot spots in your home to avoid them getting too hot. A basement, closet, or utility room that keeps chilly but above freezing are excellent storage locations in a house.
- Lilies must be kept at or below 45 degrees to prevent sprouting before planting. If they do, handle the sprouts with caution. Your bulbs won’t bloom if you break them off.
- Gladiolus and dahlias can withstand slightly hotter temps. The ideal storage temperature for them is between 40 and 62 degrees.
- Canna Lilies should never dry out and prefer to be stored at a temperature of 50 degrees.
- Elephant ears and calla lilies need warmer weather, between 60 and 70 degrees.
Prior to planting the bulbs, it is important to prevent their sprouting. If your bulbs do sprout, just treat them with extra gentleness to prevent breaking or damaging the sprout. The bulb’s only chance to develop and blossom may be that sprout.
Bring the bulbs outside as soon as you are ready to plant them and then put them in the ground or in containers in accordance with the growing instructions.
How should bulbs from daffodils be stored?
Brush off any dried dirt before putting the dry bulbs in a ventilated bag, such as a mesh veggie bag or a nylon stocking, for daffodil bulb curing and storage. Daffodil bulbs should be kept in a garage or a cold, dry basement. Make sure the bulbs are not placed in areas that are moist, cold, very hot, or in direct sunlight.
After the bulbs have had time to cure until the following planting season, examine them and throw away those that didn’t make it through the storage period. Four to six weeks before to the first expected frost in your location, replant the bulbs.
When should bulbs be placed in the refrigerator?
According to the Clemson University website, tulip bulbs must be forced out of dormancy by being refrigerated for 12 weeks at or below 40 degrees Fahrenheit in order for them to bloom. Three months after you first place them in cold storage, take them out of the fridge. Put the tulip bulbs in the fridge by the end of October, and take them out in late January, for instance, if you want the flowers to blossom in February.
Although the bulbs must be kept cold, cold storage by itself won’t cause the tulips to bloom. After the cold treatment, pot them properly and give the right cultural conditions for them.
Before planting, should bulbs be soaked?
You now understand the fundamentals, but you could still have some queries. Here are some of the questions regarding planting bulbs for spring that I am asked the most.
How deep should you plant spring bulbs?
It’s a good idea to put spring bulbs 2-3 times deeper than their height as a general rule of thumb. For the best results, however, always read the package directions.
Should you soak spring bulbs before planting?
Before planting, there is no need to soak them. However, soaking them for 12 to 24 hours can hasten the roots process if you are running late planting them.
They will root more quickly if you add fish emulsion or liquid kelp to the water before soaking.
Why are bulbs planted in the fall?
To grow and blossom, spring-blooming bulbs require a period of cold hibernation. They won’t likely blossom in the spring if they aren’t planted in the fall.
Can you plant flower bulbs in the spring?
Although it is technically possible, I don’t advise planting cold-hardy flower bulbs in the spring. If they are planted in the spring, they won’t bloom.
Additionally, there’s a chance they won’t have enough time to save the energy they’ll need to endure the winter.
Bulb planting offers such a big payoff for spring blooming. Seeing the first few green shoots pop up from the earth is so amazing. And I bet you’ll be putting more and more spring bulbs in your garden every year now that you know how simple it is.
Should I put tulip bulbs in the fridge before planting them?
In her Virginia garden, my grandma used to raise tulips. I really like them and would like to plant them in my garden, but I’ve heard Southern California doesn’t get cold enough. Ist das so?
Answer: There are two parts to the response to your query. It is true that the temperatures around here don’t drop low enough for tulips to establish a root system and return year after year like they did in your grandmother’s garden.
The key is to consider them as a “annual bulb” and pre-chill them in your refrigerator before planting. Tulip bulbs can be chilled in the refrigerator to simulate the chilly evenings of tulip-growing regions like Holland.
Tulip bulbs must be cooled. The ensuing flowers won’t be as tall and full without freezing.
Tulips rarely come back for longer than a year or two due to our warm winters. Despite the fact that some gardeners attempt to dig the bulbs up and refrigerate them, experts claim that this normally isn’t very successful.
Tulip bulbs, which ought to be showing up in nurseries, are a wonderful time to start purchasing them right now. Purchasing now ensures that you get the finest selection even though they will be available throughout the following two or three months.
Depending on the kind, tulips can bloom from March to May each spring. For the longest season of colour, try planting early, mid-season, and late kinds of tulips because their bloom is famously short-lived. Tulips of the same variety planted at different periods won’t often produce a longer show because each type is bred to bloom at a given time, regardless of when it is planted.
* To keep tulip bulbs chilled for at least six weeks, put them in a paper or plastic bag that has been hole-punched. Avoid placing bulbs close to apples because they release ethylene gas, which rots bulbs.
* From late November to the beginning of January, the bulbs can be planted. Just be careful to keep them chilled until you’re ready to plant them since after they’ve been out of the cold, they tend to weaken and mould.
* Offer superb drainage. Tulips won’t survive in muddy soil. Before planting, it’s crucial to generously amend your soil with perlite or pumice and handmade or bagged compost. Gypsum is also advised if your soil is heavy clay.
* Use high-quality potting soil with plenty of perlite or pumice, or mix some into the soil to make it lighter. Tulips thrive in containers, where they frequently create gorgeous displays, and do particularly well.
Tulip bulbs should be planted in the earth 5 to 6 inches deep and 5 inches apart, pointy end facing up.
Tulips can be grown in large numbers in pots. They can be positioned in pots such that they are an inch apart and touching. Place bulbs against the pot’s edge and work your way inside in a circle until you reach the middle.