How to Plant Fall Bulbs in Planters (and why now is the time)
Plant in October and your spring containers are already done. Here's how to layer bulbs for months of bloom, and how to help them through winter.
The first cool nights of fall tend to feel like an ending. For anyone with a planter, they're a beginning. Spring bulbs need a long, cold rest to bloom, and the weeks between late September and the first hard freeze are the best time to give them one.
Planted now, a single container can carry you from the first crocus in March to the last tulip in May. The work takes an afternoon.
The science
Why fall is bulb season
Tulips, daffodils, hyacinths and crocus all need a period of cold, roughly 12 to 16 weeks, before they'll flower. Plant once the soil has cooled to around 60°F (15°C), usually late September through October across most of Canada and the northern US, and they'll root before the ground freezes, then wait out the winter.
Start here
Choosing the right planter
Depth matters
Aim for at least 12–18" (30–45 cm) of soil so you can layer bulbs and keep them insulated.
Volume protects
The more soil a container holds, the steadier its temperature through winter. Larger square and rectangle planters, like the Fairfield 20" Square or Fairfield 20x36" Rectangle, are ideal.
Drainage is essential
Bulbs rot in standing water. Make sure water can drain freely, and raise the planter slightly off the ground if you can.
The method
How to layer a bulb lasagna
Layering bulbs at different depths means they bloom in waves from the same planter.
- Base layer: 2" (5 cm) of fresh potting mix over the drainage layer.
- Deepest layer, about 8" (20 cm) down: large bulbs such as tulips and daffodils, pointed end up, almost touching.
- Cover with 2" (5 cm) of soil.
- Middle layer: hyacinths or smaller daffodils.
- Cover with another 2" (5 cm) of soil.
- Top layer: small bulbs such as crocus, muscari or dwarf iris.
- Finish with soil to just below the rim, then water well.
TipSquirrels love a freshly planted pot. Lay a piece of chicken wire just under the top layer of soil until the ground freezes.
Right now
Color for fall, too
You don't need to wait until spring for color. Top the planter with pansies, violas or a low heuchera. Their shallow roots won't disturb the bulbs below, and they'll give you color through the fall. Many violas will return in early spring alongside the first crocus.
Cold climates
Helping bulbs through a cold winter
In colder regions (roughly Zone 6 and below), soil in a container freezes faster and deeper than garden soil. A few steps help:
Group planters together against a sheltered wall of the house.
Choose the largest planter you have, since more soil means more insulation.
Water sparingly through winter. Soil should be barely moist, not wet.
In very cold areas, move planters into an unheated garage or shed until late winter.
Come spring
What to expect in spring
Crocus usually appear first, often while there's still snow nearby, followed by muscari and hyacinth, then daffodils, then tulips. When the last bloom fades, let the foliage die back naturally before you replant for summer.