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When to Plant Flower Bulbs: A Month-by-Month Planting Calendar
Getting the planting window right is the difference between bulbs that flower and bulbs that rot in the ground. The good news: most flower bulbs are far more forgiving about timing than people think — and the timing mainly decides when you get flowers, not whether you get them.
The short version
- Spring-planted bulbs (amaryllis, most lilies): plant March to May, flower the same year.
- Autumn-planted bulbs (tulip, daffodil, hyacinth, crocus, allium): plant September to November, flower the following spring.
- Plant as soon as the ground is workable — bulbs are sold to be planted, not stored.
Why the autumn rule exists
Tulips, daffodils, hyacinths and crocus need a stretch of cold — roughly 12 to 16 weeks below about 45°F — before their roots start and the flower bud inside forms. Plant them in warm soil and you get leaves and no flowers, or worse, bulbs that simply rot. This is also why bulbs sold in spring are usually pre-chilled: they were kept in cold storage so you can plant them late.
Month by month
September to November — the big autumn window
This is the most important planting window of the year. Tulips, daffodils, hyacinths, crocus and allium all go in now, while the soil is still warm but the air has turned cool. They root before the ground freezes, then sit through winter and flower in spring. Plant daffodils as early as you can — the deeper they root now, the better they flower next year.
December to February — plant your amaryllis
Amaryllis is the indoor bulb of the season, and it works on a simple timetable: plant from October to February and it flowers 6–10 weeks later, in time for the holidays and the new year. Give it a pot that is only slightly wider than the bulb, a bright warm spot, and water sparingly until the flower spike appears.
March to May — plant your lilies
Lilies are planted in spring and flower the same summer, usually June to August. Unlike tulips, they do not need cold. Plant them as soon as the soil has warmed and you can work it without it turning to mud, and keep them moist until they are established.
June to August — the lilium specialty window
Container bulbs — desert rose, stephania — can be planted any time the soil is warm. If you are buying one mid-summer, expect the plant to establish first and put on its main show the following season.
How deep, how far apart
As a rule, plant a bulb three times its own height deep and three times its own width apart. Amaryllis goes in with a third of the bulb above the soil. Tulips and daffodils want a full 6 inches, and deeper in cold-winter regions. Crocus and hyacinth are shallow — 3 to 4 inches. Container bulbs sit on top of the mix with about a third of the bulb showing.
What to do if you have already missed the window
- Missed autumn? Buy your bulbs now and store them cool and dark until planting. Keep them out of the fridge with fruit, and plant as soon as the ground is workable.
- Missed spring? Plant now anyway. Spring-planted bulbs often flower a little later and sometimes smaller, but they will bloom.
- Missed the whole year? Order early and pick a realistic date. Bulbs sold in autumn are pre-chilled and can be held a few weeks without trouble.
Three mistakes that kill bulbs
Planting too shallow exposes bulbs to temperature swings and animals. Waterlogging rots them in days — if the soil holds water for more than a few minutes, add grit or plant somewhere else. Storing them warm for weeks before planting wakes them up early, so keep them cool, dark and dry until the ground is ready.
Common questions
Can I plant bulbs in containers?
Yes. Use a pot at least twice the bulb’s depth with drainage holes, and plant three to five bulbs per pot for a full display. Container bulbs need more feeding than garden bulbs, but they are far easier to move for a cool windowsill.
Do I need to chill tulip bulbs in the fridge?
Only if you are planting them in a warm climate and want them to flower the following spring. Chill them for 12–16 weeks in a fridge away from fruit, then plant.
How deep should I plant amaryllis?
About a third of the bulb above the soil line, in a pot only slightly wider than the bulb. A bigger pot holds too much water and the bulb will rot.
What if my bulbs never flower?
Usually one of three things: not enough sun, too much nitrogen in the feed, or a bulb that was cut back too early the previous year. Bulbs store their energy in the leaves, so let the foliage die back naturally.
