Crocus: Early Spring Jewels and Fall-Blooming Saffron

Crocus: Early Spring Jewels and Fall-Blooming Saffron

Crocus corms multiply amazingly and thrive in full sun to partial shade where early color is wanted. They naturalize beautifully in lawns. Two types of spring Crocus: species (unusual coloration) and hybrids (larger flowers, generally C. vernus selections). Species bloom earlier—use both to prolong the season. We offer mixtures for loads of bright early-spring blooms. For landscape impact, plant in quantity—several thousand bulbs are marvelous, and volume discounts make it affordable.

Fall-Blooming Crocuses

Less known but exquisite: fall-blooming species from Europe and the Near East with refined goblet-shaped flowers on 3–5 inch stems in September–October. We offer a mix and individual varieties. Saffron Crocus, famous for culinary color and flavor, belongs here. Like fall-blooming Colchicums, bulbs ship in late summer—order early.

Forcing Crocus Bulbs

Crocuses are among the easiest cold-hardy bulbs to force in pots for indoor bloom. Full instructions accompany orders and are detailed below.

What We Ship

Premium, top-quality bulbs in fall, at the correct outdoor planting time for your region.

Crocus Care Summary

• Planting: Dig hole to label-indicated depth (~3–5 inches; label is 6 inches long). Set bulb flat side down, pointed end up. Fill and water thoroughly.
• Light/Watering: Best in full sun (6+ hours); tolerate light shade. Thrive under deciduous trees if root competition isn't severe and they get 3–4 hours sun after leaf-out. Water thoroughly after planting unless soaking rain expected. Water again only if rainfall scarce. Once established: ample moisture (½–1 inch rain/week) during active growth (fall–winter–late winter/early spring); dry soil during summer dormancy. Avoid soaker hoses/sprinklers.
• Fertilizer/Soil/pH: Well-drained soil year-round. Improve heavy soil with compost, aged manure, leafmold, peat moss, or shredded pine bark (South). In heavy clay, consider raised beds. Tolerate acid soil; thrive in neutral to slightly alkaline. Best fertilize in fall when sending new roots; next best early spring as foliage emerges. Use slow-release bulb fertilizer (granular Daffodil fertilizer). Apply to soil surface after planting and each fall. Avoid bone meal (only phosphorus; attracts dogs/rodents).
• Bloom Time: Label times typical for Litchfield, CT. Earlier spring = earlier bloom; colder climates = delayed. First spring after planting, most bulbs (especially from cool-summer climates like Holland/England) bloom later than established bulbs—normal; subsequent years bloom on schedule.
• Dormancy: Most go dormant 8–12 weeks after flowering. Period between flowering and foliage withering is crucial for future vigor. Don't cut, fold, or braid leaves before yellowing/collapse—may prevent energy storage for next year's bloom. Hide curing foliage by interplanting with leafy perennials, annuals, or groundcovers. In lawns, don't mow until bulb foliage yellows.
• Transplanting/Dividing: Best when foliage has withered, signaling end of active growth. Lift with digging fork/spade, avoid injuring bulbs, replant immediately at same depth, ~3x diameter apart.
• Pests/Diseases: Bulbs generally trouble-free, but rodents/deer may eat bulbs, foliage, or flowers in some areas.

Forcing Cold-Hardy Bulbs (Detailed)

Many spring bulbs can be "forced" to bloom indoors in winter. "Rooting time" = weeks bulbs must be kept cold (~40°F) and moist before blooming.

Containers & Potting Mix

Any pot with room for root growth (~3–4 inches below bulbs). If no drainage hole, water very carefully—soggy mix rots bulbs. Recommend soilless potting mix (holds moisture, drains well).

Potting the Bulbs

1. Moisten mix in tub/bucket until damp, not soggy.
2. Fill container ~½ full.
3. Set bulbs flat side down on mix, spaced closely (almost touching).
4. Add mix to cover bulbs up to necks, leaving tips exposed.
5. Water thoroughly.

Chilling the Bulbs

Keep cold and moist for rooting period (8–10 weeks for Crocus). Ideal: 40–60°F first 3–4 weeks, then 32–40°F for remainder (mimics outdoor temperature drop). Can chill in cold basement, unheated garage (above freezing), or refrigerator. If temperature shift is hard to arrange, most bulbs root properly if temperature stays near 40°F. Protect from rodents with steel mesh. Check moisture every few weeks; water when surface dry.

Checking Readiness

Toward end of rooting time, check for fleshy white roots poking through drainage holes—bulbs ready to bloom. If no roots, give more cold time. Don't judge by top shoots—without roots, bulbs won't flower properly. Extra chilling time tolerated; orchestrate succession of winter bloom.

Bringing Into Bloom

When rooted, bring pots out of cold storage to bright window in cool room (<65°F). Bright light keeps leaves/stems compact; weak light causes flopping. White shoots from cold storage turn green quickly in sunlight. Monitor moisture: initially water ~once a week; by bloom, may need daily. Most bloom 2–5 weeks after leaving cold. Duration shorter than garden bloom. Warm temps/low humidity speed decline. Keep out of direct sun; move to cool room at night to prolong bloom.

After Bloom

Recommend tossing bulbs on compost. If kept in sunny window and watered, forced bulbs can be planted outdoors after hard frost passes, but won't bloom well for 2+ years. Better to buy enough for indoor and outdoor planting.

Growing and Harvesting Saffron Crocus

Saffron threads are the stigmas of Saffron Crocus flowers. Hundreds of flowers needed for commercial amounts—hence high cost. For home gardeners, two dozen corms supply enough for a few memorable dishes the first year. Corms multiply yearly; after 4–6 years, divide and replant after foliage fades to prevent overcrowding and decreased flowering.

Planting Saffron Crocus Corms

In reliably hardy areas (USDA Zone 6–8 South, 6–9 West), plant corms ASAP upon receipt. Full sun, well-drained, moderately rich soil, relatively dry in summer dormancy. Plant 4 inches deep, 4 inches apart. If gophers/mice/voles are a problem, plant in containers or line bed with hardware cloth. Flowers appear first fall after planting (Sept–Oct), last ~3 weeks. Grass-like leaves may emerge soon after flowers or wait until spring; persist 8–12 weeks, then vanish. Mark planting area to avoid accidental digging.

Overwintering in Cold Climates

In zones colder than 6, lift corms after first few frosts but before ground freezes solid. Place in wooden crate/plastic tub, cover completely with dry peat moss or sand. Store cool (40–50°F), dry (basement). Replant in spring after frost danger passes; don't water until new growth in early autumn. Alternative: plant corms 2 inches deep in clay/plastic pots with well-drained mix, set pots in ground with rims ~2 inches below soil. After dieback in fall, move pots to basement, store dry. Set out next spring. Mark pot locations.

Harvesting and Using Saffron

Three stigmas per flower. Best harvest: mid-morning on sunny day when flowers fully open and fresh. Pluck stigmas carefully, dry in warm place, store in closed container. To use: steep threads in hot liquid (water, broth, milk) ~20 minutes. Add threads and liquid early in cooking/baking; they continue releasing color and flavor.