How to Grow Snowdrops: Plant Galanthus About 3 Inches Deep in Fall, Divide Them ‘In the Green’ After Bloom, and Know Where They Fade in the South

Plant snowdrop bulbs about 3 inches deep in early fall, or move whole clumps right after they flower while the leaves are still green. The second method is called planting “in the green.” The Royal Horticultural Society (RHS) puts it second only to replanting freshly lifted clumps in late spring, and it treats dry bulbs as the fallback because snowdrop bulbs are “very prone to drying out.”

Depth is less settled than most guides admit. The six extension pages compared below range from 2 to 5 inches, and grower reports on whether dry bulbs work at all point in different directions. Where the evidence is thin, this guide says so. It also covers why the flowers survive frost (an Austrian freezing test, not the antifreeze story you may have read), which snowdrop to buy for your zone, and where in the South they fade. If you came for the symbolism instead, see snowdrop meaning.

How Deep to Plant Snowdrop Bulbs: Extension Pages Range From 2 to 5 Inches

Plant snowdrop bulbs about 3 inches deep and 3 inches apart, in groups. Wisconsin and Ohio State both give exactly that, and Iowa State says 3 to 4 inches. The other pages differ, as the table shows. Ohio State recommends drifts of 10 to 25 or more.

Three inches sits in the middle of that spread, and only NC State’s giant snowdrop entry goes to 5. Iowa State measures depth “from the base of the bulb to the soil surface,” so measure from the bottom of the bulb, not the top. Its general rule is a depth of two to three times the bulb’s maximum diameter, and under that rule it puts snowdrops and crocus at 3 to 4 inches and trumpet daffodils at 6 to 8.

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Timing for dry bulbs is early fall. Wisconsin says to plant “early in the fall after the soil has cooled,” which it puts at nighttime temperatures of 40 to 50°F. Iowa State’s general advice for spring bulbs in Iowa is October, or as late as December if the ground stays unfrozen, but the next section shows why snowdrop growers are less relaxed about late planting. If you are planting daffodils the same weekend, they follow a soil-temperature calendar of their own: see when to plant daffodil bulbs.

Dry Bulbs or “In the Green”? What Is Documented and What Is Grower Lore

If you can get them, buy snowdrops in the green. The RHS’s first choice is freshly lifted snowdrops planted “when the foliage is just dying back in late spring.” Buying just after flowering, when the leaves are still green, is in its words “the next best way of establishing snowdrops,” and nurseries sell them by mail order in bundles or pots. For dry bulbs the RHS says that if a nursery or garden centre is the only option, buy them as soon as they are available and plant immediately.

US extension services give the same timing, and only Arkansas gives a reason. Wisconsin says to plant dry bulbs in fall but to transplant “after flowering when still green, if possible.” Arkansas says the recommended time for moving snowdrops is while the foliage is still green, and its stated reason is modest: it “makes it easier to find the plants.” Penn State’s Master Gardeners say to divide them soon after they finish blooming.

The documented part of the mechanism is dryness: the one reason the RHS gives is that snowdrop bulbs are very prone to drying out. The claim that dry snowdrop bulbs fail while tulips do not is not in any source we fetched. The RHS defines bulbs as storage organs “usually sold and planted while dormant,” with daffodils and tulips as examples.

The rest is grower experience, and it conflicts. In a 2015 Pacific Bulb Society thread, a Denver grower said in-the-green snowdrops survive far better than ones planted in October or November (“one hundred percent vs. about zero percent”), and thought that bulbs shipped late have no roots and too little time before winter. A grower in Portland, Oregon, replied that they would rather receive bulbs in August or September, because most bulbs there have time to root before the ground freezes. A Toronto grower said the bulbs they got in fall did not have time to establish before winter. A 2008 post on the same list relays that John Grimshaw argued dry snowdrop bulbs are fine if kept cool and dry. The poster who relayed that, in eastern North America, saw first-year results vary by species: bulbs that grew and bloomed were mostly forms of G. elwesii, while ones that “grew haltingly” were often G. nivalis. None of this is a controlled trial, and none of the sources above compares the two methods side by side.

Putting the evidence together, this is what we would do:

1. Cheapest: dig a clump from a friend’s garden just after it flowers and divide it. Wisconsin says to dig and divide “immediately after flowering while the foliage is still green” and to replant immediately.
2. Buying plants: order in the green for delivery after your plants would normally finish flowering (spring in most of the US), and plant them the day they arrive.
3. Buying dry bulbs: order early, plant on arrival, and keep them out of a warm garage in between, since the RHS says they dry out. If they arrive before nights cool to 40 to 50°F (Wisconsin’s trigger), we plant at once, following the RHS’s “plant immediately.” The growers above suggest G. elwesii forms may be the safer pick, but that is anecdote.

When you replant divided bulbs, Arkansas Extension sets them about 3 inches apart and 2 inches deep, which is shallower than the 3 inches Wisconsin gives for dry bulbs.

Why Snowdrops Bloom Through Snow: What an Austrian Freezing Test Found

Snowdrop flowers can have ice form in them and still live. Researchers at the University of Innsbruck tested Galanthus nivalis from the university’s botanical garden with an infrared camera and reported in the journal Plants in 2021 that “flowers of Galanthus nivalis and Scilla forbesii were ice tolerant.”

In the test with intact plants dug up in lawn pieces, ice formed in the flowering shoots at about −5.0 to −5.5°C (22 to 23°F) and in the leaves at about −4.8 to −6.8°C (20 to 23°F), and each flower and leaf froze separately from the others. The plants were frozen down to −8.9°C (16°F), planted back outdoors, and showed no visible damage when the researchers checked a few days later. With the soil removed, ice started in the roots instead, at about −1.6 to −3.2°C (roughly 26 to 29°F), and spread barrier-free through the bulb, leaves and flower. The paper’s explanation is soil, not a chemical: it “thermally insulates the below-ground organs and the shoot,” and the authors also describe soil as a thermal barrier against ice spreading between individual flowers and leaves. They add that the tepals (petals and petal-like parts) could still show frost injury when ice formed in them.

Two cautions. This was a freezing test on G. nivalis sampled at one botanical garden, with seven intact plants in the lawn-piece experiment. And the popular explanations (antifreeze proteins in the sap, or heat given off by the flower) do not appear in the paper, and we found no source for either. Treat them as unproven.

Cold is also something snowdrops need. Penn State’s Master Gardeners say snowdrops need a cold period to bloom, with temperatures going below 20° (the page gives no unit), and NC State says snowdrop seeds need a cold spell below 20°F to germinate. Bloom time follows: January through March in Penn State’s description, and late February or March in much of Pennsylvania. For what comes after them, the spring bloom sequence runs from snowdrops to alliums.

G. nivalis vs. G. elwesii vs. G. woronowii vs. ‘Flore Pleno’: Height, Bloom Time, Zones and Spread

Of the four, G. nivalis has the widest zone range in the NC State and Arkansas listings (NC State gives zones 3 to 9), and G. elwesii is the tallest (6 to 12 inches). For G. woronowii, Wisconsin says only that it is “listed by some as hardy to zone 2,” and ‘Flore Pleno’ has no USDA zone listing in the sources we checked. The RHS rates both H5, a UK hardiness rating of −10 to −15°C (about 5 to 14°F). None of the pages gives a spread rate in inches per year, so the last column reports what each page says about spreading.

Which one to choose:

• Coldest gardens: G. nivalis. Wisconsin lists common snowdrop as hardy to zone 3 and says most Galanthus species are hardy to zone 5.
• Warmer gardens, or a taller flower: G. elwesii. Wisconsin says it “withstands hot weather better than common snowdrops,” and its flowers are 1¼ to 2 inches long against 1 inch for common snowdrop. Wisconsin also says it is “not as hardy,” surviving reliably only to zone 4 or 5, and NC State’s zone listing stops at 7b.
• Wet, shady spots: G. woronowii, which a Pacific Bulb Society poster says grows in damp meadows and light wet woodland in the wild. One of that list’s contributors believes the snowdrop sold locally as G. woronowii performs badly from dry bulbs, so buy it in the green.
• Woodland drifts with double flowers: ‘Flore Pleno’, which Wisconsin calls “excellent for naturalizing in woodlands.”

Labels are a gamble. Arkansas Extension notes that the species hybridize readily, so most nursery plants are hybrids, and Wisconsin says G. woronowii is often sold as G. ikariae latifolius. The RHS also uses “giant snowdrop” for G. woronowii, a name NC State gives to G. elwesii. Read the supplier’s description of height and flower size rather than trusting the name alone.

On the question of which species spreads fastest, the sources do not rank them. Wisconsin says snowdrops “do not multiply as readily as some of the other small bulbs,” often taking a few years to become established, and that seed-grown plants take about 4 years to bloom. NC State says common snowdrop “easily spreads” by seed and offsets and that giant snowdrop “can grow into large colonies.” We name no winner.

Do Snowdrops Grow in the South? Where the Sources Split

Snowdrops are a cold-climate bulb, and the sources split on how far south they go. NC State lists common snowdrop for zones 3 to 9, Arkansas says zones 3 to 8, and NC State’s giant snowdrop page stops at 7b and warns it “may be short-lived when grown south of USDA Zone 7.” Penn State’s Master Gardeners go further and say snowdrops will not be found in southern gardens, because they need temperatures below 20° (the page gives no unit) to bloom.

The two main species’ listings overlap at zones 4 to 7, and at zones 8 and 9 the sources hedge. Penn State and NC State both tie the southern limit to a cold requirement rather than to winter damage. NC State says of common snowdrop that, because the seeds need a cold spell, “the plant may have a shorter lifespan in warmer climates.” Zone 7 is the working southern limit in NC State’s giant snowdrop listing. NC State also lists common snowdrop as naturalized in North Carolina and Virginia, so the Upper South is not out of reach. The RHS adds one more risk in mild climates: it says grey mould can affect snowdrops, “especially in mild winters.”

UK readers: the RHS rates G. woronowii and ‘Flore Pleno’ H5, meaning hardy in most places throughout the UK even in severe winters (the RHS’s wording). That is a UK rating, not a USDA zone, so do not read H5 as zone 5.

Naturalizing Snowdrops Under Trees and in Lawns

Deciduous trees are the best home for snowdrops, because the bulbs get spring sun and then summer shade. NC State describes giant snowdrop as thriving in that “difficult-to-grow location under deciduous trees” since it “receives full sun in the early spring,” and the leaf canopy later “protects the plant.” Penn State makes the same observation: snowdrops bloom and die back before the trees leaf out. NC State also suggests large drifts in woodland margins, meadows and lawns under large deciduous trees.

The foliage must die back before you cut or mow it. NC State says the leaves “should be left to yellow on spent bulbs because they provide nutrients for the next year’s bloom.” In a lawn, Wisconsin says not to mow until the foliage has matured, about 6 weeks after blooming. Wisconsin also says to fertilize in early spring when shoots first appear or after blooming.

Summer moisture is where two cool-climate sources disagree. The RHS says “it is important that the soil does not dry out in summer.” Wisconsin says that when possible you should allow the soil to dry out in summer. We found nothing that reconciles the two, so treat it as an open question; NC State’s point about summer shade under deciduous trees is the one concrete help.

For a spring-long display, Wisconsin pairs snowdrops with winter aconite, Siberian squill, glory-of-the-snow and small daffodils.

Snowdrop Care Calendar: When to Plant, Divide, Feed and Mow

Miss the green window and the clump is harder to find: Arkansas Extension’s stated reason for moving snowdrops while the foliage shows is that it “makes it easier to find the plants.”

Why Aren’t My Snowdrops Doing Well? Symptom, Cause and Fix

Are Snowdrops Poisonous? Pets, Deer and Squirrels

Yes, snowdrops are poisonous if eaten. Pet Poison Helpline says snowdrops contain the alkaloids lycorine and galanthamine throughout the plant, with the bulbs highest, and that eating them causes gastrointestinal distress in pets, such as drooling, vomiting and diarrhea. The RHS plant profiles for snowdrops mark them “harmful if eaten” for humans and for pets (dogs, cats) and advise gloves when handling. Penn State adds that some gardeners get skin irritation. If a pet eats bulbs, Pet Poison Helpline’s 24/7 number is (855) 764-7661, or call your vet.

Deer and rodents are a smaller worry. Wisconsin says the bulbs “usually are not bothered by deer, rabbits, voles, or other rodents,” Ohio State lists deer, rabbits, chipmunks and mice as not bothering them, and NC State and Penn State both call them deer resistant. The one pest warning is the RHS’s on squirrels digging up dry-planted bulbs. For other bulbs that deer pass over, see deer-resistant bulbs.

Snowdrop FAQ

How deep should you plant snowdrop bulbs?

About 3 inches deep and 3 inches apart. Wisconsin and Ohio State give 3 inches, Iowa State gives 3 to 4 (measured from the base of the bulb), Penn State gives 2 to 3, Arkansas gives 2 for replanted divisions, and NC State gives 5 for G. elwesii.

Can you plant snowdrops in spring?

Yes, as clumps in the green right after flowering. The RHS’s first choice is freshly lifted snowdrops planted when the foliage is just dying back in late spring, with in-the-green plants next best. Dry bulbs are a fall job.

When is the best time to divide snowdrops?

Right after they finish blooming, while the leaves are still green. Wisconsin and Penn State both say to divide then, and Wisconsin says to replant immediately.

Do snowdrops spread?

Yes. Wisconsin says snowdrops do not multiply as readily as some other small bulbs but eventually form large, compact colonies if left undisturbed, while NC State says common snowdrop easily spreads by self-seeding and bulb offsets. The sources give no rate.

Are snowdrops poisonous to dogs and cats?

Yes. Pet Poison Helpline reports lycorine and galanthamine in all parts of the plant, highest in the bulbs, and gastrointestinal signs after ingestion. The RHS lists dogs and cats as at risk.

Will snowdrops grow in the South?

In zones 8 and 9 the sources hedge. NC State lists common snowdrop for zones 3 to 9 but says it may have a shorter lifespan in warmer climates, and Penn State’s Master Gardeners go further and say snowdrops need a cold period to bloom and will not be found in southern gardens.

Sources

1. Bertel C, Hacker J, Neuner G. Protective Role of Ice Barriers: How Reproductive Organs of Early Flowering and Mountain Plants Escape Frost Injuries. Plants 2021;10(5):1031
2. NC State Extension. Galanthus nivalis (common snowdrop). Extension Gardener Plant Toolbox
3. NC State Extension. Galanthus elwesii (giant snowdrop). Extension Gardener Plant Toolbox
4. Mahr S. Snowdrops, Galanthus spp. University of Wisconsin-Madison Extension, Wisconsin Horticulture, revised October 23, 2025
5. Chanon A. Snowdrops: Beauty in the Midst of Chaos. Ohio State University BYGL, March 23, 2020
6. Klingaman G. Snowdrops. University of Arkansas Division of Agriculture Cooperative Extension Service, Plant of the Week, March 6, 2009
7. Penn State Extension Master Gardeners, Luzerne County. January: Snowdrop
8. Iowa State University Extension and Outreach. Selecting and Planting Spring-Blooming Bulbs. Yard and Garden
9. Royal Horticultural Society. How to grow snowdrops. RHS Growing Guide
10. Royal Horticultural Society. Galanthus woronowii (giant snowdrop). RHS Plant Profile
11. Royal Horticultural Society. Galanthus nivalis f. pleniflorus ‘Flore Pleno’ (d). RHS Plant Profile
12. Pet Poison Helpline. Snowdrops are toxic to pets
13. Pacific Bulb Society mailing list. Sourcing unusual galanthus (Nold, McGary, Hawthorn), March 2015
14. Pacific Bulb Society mailing list. Galanthus requirements (McKenney, Brown), January 2008