How to Make a Bulb Garden: Plan for Long Bloom
Learning how to make a bulb garden starts with site, soil plus timing. University of Maryland Extension notes that spring bulbs flower from January to May, while summer bulbs flower from June to September. Mixing both types stretches color across the year.
The short answer
Pick a site with at least five to six hours of direct sun, as University of Maryland Extension advises. Make sure the soil drains well. Plant spring bulbs in fall at two to three times their height in depth. Add summer bulbs for later color.
Where should a bulb garden go?
Sun plus drainage come first. University of Maryland Extension notes that bulbs left in the ground year after year need eight to 10 hours of daily sun for good flowering.
Early spring bulbs bloom before most trees leaf out. Illinois Extension notes that they can grow under trees plus shrubs. Clemson Extension adds that flowers last longer without midday sun.
How do I prepare the soil?
Drainage is the big one. Illinois Extension notes that good soil drainage is key for bulbs. Clay soil can be improved with compost, peat moss or other organic matter.
Clemson Extension suggests mixing 2 to 3 inches of organic matter into beds 10 to 12 inches deep. Raised beds can also help solve drainage problems.
| Season | Bloom window | Plant |
|---|---|---|
| Spring bulbs | January to May | Late summer to fall |
| Summer bulbs | June to September | Spring, after frost |
| Tulips plus daffodils | Spring | Fall, about 8 inches deep |
Source: University of Maryland Extension plus Illinois Extension.
How deep should bulbs go?
Illinois Extension gives a rule of thumb: plant spring bulbs two to three times as deep as the bulb is tall. Large bulbs such as tulips go about 8 inches deep, while small bulbs go 3 to 4 inches.
Depth is measured from the bottom of the bulb. University of Maryland Extension notes that shallow planting may encourage frost heaving.
How to: step by step
- Pick a site with five to six hours of sun.
- Dig organic matter into the bed for drainage.
- Combine early, mid plus late season bulbs.
- Set spring bulbs in fall at the right depth.
- Water during bud, bloom plus early leaf growth.
- Let foliage remain until it yellows.
Troubleshooting
Bulbs rotted in the ground: poor drainage. University of Illinois Extension links rotted bulbs to a poorly drained site.
Leaves but no flowers: bulb source or storage. Illinois Extension suggests questioning both.
Bulbs missing in spring: rodents. Illinois Extension suggests a small cage of half inch mesh around the bulbs.
For related reading see planning a garden layout, soil drainage in beds plus mulch for beds. Kind Seed Co also stocks cannabis seeds.
Sources
- Planting bulbs, Illinois Extension
- Spring flowering bulbs, Clemson Cooperative Extension
- Bulbs, University of Maryland Extension
- Bulbs, Illinois Extension
FAQ
When should spring bulbs be planted?
In fall. University of Maryland Extension notes that hardy spring bulbs are planted in late summer or early fall. Illinois Extension adds that most bulbs can go in until the ground freezes. In coastal South Carolina, Clemson Extension notes that most bulbs go in late December or early January.
Should bulb leaves be cut after blooming?
Not right away. Illinois Extension notes that tulip leaves should stay in place until they are almost completely yellow. The green leaves are building energy for next year's flowers. Once they yellow, cut them to the ground. Clemson Extension also advises waiting for foliage to yellow before digging bulbs.
How much water do bulbs need?
Illinois Extension suggests about one inch of water per week through the bud, bloom plus early leaf stage if rain falls short. Water deeply, since bulbs may sit 6 to 8 inches down. A soaker hose holds water off the blooms while the soil around the bulbs soaks through.
Can bulbs grow under trees?
Many early ones can. Illinois Extension notes that early spring bulbs bloom before most trees plus shrubs leaf out, so they can grow beneath them. Clemson Extension adds that most early flowering bulbs can be planted under deciduous trees, since the bulbs go dormant by the time the trees cast heavy shade.
When should crowded bulbs be divided?
After the foliage fades. University of Maryland Extension notes that bulbs dug before the foliage fades are useless. Dig up the entire clump, separate the bulbs plus replant them elsewhere. Clemson Extension notes that divided bulbs can be replanted right away or stored somewhere dry plus cool until fall.
