October is a quiet month in most gardens.
The vegetables are winding down, and the flower beds look tired.
Yet this is exactly when next spring begins.
Daffodils, tulips, hyacinths and crocus all go into the ground in fall.
They spend the winter growing roots, then bloom while the garden still looks bare.
Many of them come back and multiply for years with very little care.
This guide follows the spring-flowering bulbs fact sheet from Clemson Cooperative Extension.
It covers when to buy, where and how deep to plant, and how to help bulbs bloom again.
What Counts as a Bulb
Gardeners use the word bulb loosely.
Clemson Extension notes that it covers true bulbs and similar structures such as corms, tubers and rhizomes.
All of them store food underground.
That stored food carries the plant through cold winters and dry summers.
Spring bulbs bloom between late winter and early summer, depending on the kind.
After blooming, their leaves keep working for a while to refill the bulb.
Then the leaves die back, and the bulb rests underground through summer.
In fall it starts growing roots again, ready for the next spring.
When to Buy and When to Plant
Clemson Extension suggests buying bulbs in September or October, while the selection is good.
Choose firm bulbs with no mold, soft spots or bruises.
Store them somewhere cool, below 60 degrees Fahrenheit, until you plant.
Keep them away from fruit, since ripening fruit gives off ethylene gas that can stop blooming.
Daffodils can go in during October or November.
For most other spring bulbs, wait until the soil at planting depth stays below 60 degrees Fahrenheit.
Timing shifts with your climate, so the right date comes later in warm regions.
The Clemson fact sheet is written for South Carolina, so your local Extension office can confirm the timing for your area.
The chilling period
Most spring bulbs need a long cold spell before they can flower.
Clemson Extension puts this chilling period at 12 to 16 weeks.
Without enough cold, flowers open close to the ground on very short stems.
In mild-winter areas, gardeners chill bulbs in the refrigerator in ventilated bags before planting.
Some suppliers also sell bulbs that have already been chilled.
Choose the Right Spot
Bulbs grow best in full sun or part shade.
Clemson Extension notes that flowers last longer when they are shaded from the strong midday sun.
Many early bulbs do well under deciduous trees.
They finish blooming and begin to go dormant before the trees fill in with leaves.
Daffodils need at least six hours of sun a day while their leaves are green.
Bulbs can also grow in lawns, around trees, or in pots and window boxes.
Drainage Comes First
Good drainage is the most important need for spring bulbs.
Bulbs that sit in soggy soil for long periods often rot.
If water tends to stand in your bed, mix in 2 to 3 inches of organic matter.
Clemson Extension suggests shredded pine bark or compost, worked 10 to 12 inches deep.
A raised garden bed is another calm way to solve wet soil.
Test the Soil and Feed Lightly
Most bulbs prefer a soil pH between 6 and 7.
Clemson Extension recommends adding lime and fertilizer based on a soil test.
Our guide to taking a garden soil sample walks through the steps.
Bulbs planted for a single season of color do not need fertilizer.
The bulb already holds the food for its first bloom.
For bulbs you want to keep for years, mix a slow-release complete fertilizer into the planting area in fall.
Follow the rate on the label.
How Deep to Plant
Depth is the detail that matters most at planting time.
Clemson Extension gives a simple rule.
Plant each bulb three to four times as deep as the bulb is wide.
Measure that depth from the base of the bulb.
So a bulb 2 inches wide goes about 6 to 8 inches deep.
Set each bulb with its pointed tip facing up and its flat base down.
Space large bulbs 3 to 6 inches apart and small bulbs 1 to 2 inches apart.
Bulbs look best planted in groups rather than in single rows.
Depths for common bulbs
- Daffodils: 6 to 8 inches deep and 3 to 6 inches apart, a little shallower for small kinds.
- Tulips: 6 to 8 inches deep and 4 to 6 inches apart.
- Hyacinths: 4 to 6 inches deep and 3 to 6 inches apart.
- Crocus: 3 inches deep and 3 to 4 inches apart.
Clemson Extension notes that daffodils planted too shallow can give sparse blooms later.
Mulch and Water
After planting, cover the bed with 2 to 3 inches of mulch.
Mulch insulates the soil and keeps moisture even.
It also stops mud from splashing onto the flowers in spring.
Our guide to mulching garden beds covers materials and depth.
Normal rainfall is usually enough for spring bulbs.
In a hot or dry spring, extra water helps the flowers last longer.
Some bulbs send up leaves in late fall or winter.
Clemson Extension says this is normal and needs no special protection.
After the Flowers Fade
This step decides whether your bulbs bloom again next year.
Snip off faded tulip and daffodil flowers so the plant does not spend energy on seeds.
Leave the leaves in place for at least six weeks, or until they turn brown.
The green leaves rebuild the food stored in the bulb.
Cutting them too soon is one of the common reasons bulbs stop blooming.
If the yellowing leaves bother you, plant perennials or summer annuals nearby to hide them.
Dig carefully near the bulbs so you do not damage them.
Dividing Crowded Clumps
Over the years, many bulbs multiply and become crowded.
Crowded clumps produce fewer flowers.
Wait until the leaves have yellowed and withered, then lift the clump.
Separate the bulbs and replant them right away, or store them somewhere cool and dry until fall.
Throw away any bulbs that look diseased.
Clemson Extension suggests dividing and thinning large daffodils every three or four years.
Why Bulbs Sometimes Do Not Bloom
Clemson Extension lists several common reasons:
- Soil that stays wet for long periods.
- Clumps that are overcrowded.
- Too much shade.
- Planting too shallow.
- Leaves cut off too soon in spring.
- Not enough winter cold.
Some bulbs, especially many tulips, rarely bloom a second year in warm climates.
In those areas, gardeners often treat tulips like annuals and plant fresh bulbs each fall.
Daffodils are usually the most reliable choice for coming back year after year.
Protecting Bulbs From Animals
Animals often dig up and eat tulip and crocus bulbs during the winter.
Clemson Extension notes that they rarely eat daffodil bulbs.
The only sure protection is to plant bulbs inside a wire mesh enclosure.
If animals dig in your yard, daffodils are the calmest choice.
A Simple Bulb Planting Checklist
- Buy firm, clean bulbs in early fall.
- Store them cool and away from fruit.
- Plant daffodils in mid-fall and others once the soil cools below 60 degrees Fahrenheit.
- Choose a well-drained spot with sun or part shade.
- Plant three to four times as deep as the bulb is wide, tip up.
- Plant in groups and mulch 2 to 3 inches deep.
- Remove faded flowers but keep the leaves for six weeks.
- Divide crowded clumps after the leaves wither.
A Calm Way to See It
Planting bulbs is an act of quiet patience.
You tuck them in on a cool fall day and then let them rest for months.
Late winter brings the first green tips, and spring does the rest.
Sources and Further Reading
- Clemson Cooperative Extension, Home and Garden Information Center — Spring-Flowering Bulbs: supports buying and storing bulbs, planting time, the chilling period, site and drainage, soil pH, fertilizing, planting depth and spacing, mulch, care after bloom, dividing, reasons for poor bloom and protection from animals.
- Clemson Cooperative Extension — Soil Testing: how to test soil before adding lime or fertilizer.
- Clemson Cooperative Extension — Mulch: choosing and spreading mulch over garden beds.