Crocus
Also known as: Crocus vernus · Saffron Crocus (C. sativus)
When & where
Germination
Spacing & depth
How to plant
Plant corms in fall in well-drained soil — points up. Excellent naturalized in lawns; delay first mowing until foliage yellows. For saffron, plant Crocus sativus in late summer and harvest the red stigmas at bloom.
Grower's tip
Squirrels dig corms — plant with wire mesh over the planting or interplant with daffodils. Colonies expand each year.
Soil preferences
Loose, well-drained soil — bulbs rot in wet feet.
6.0–7.0
Compost + bone meal or rock phosphate worked into the planting hole.
Watering
Water in at planting, then only during active growth. Let bulbs go dry during dormancy.
Deep watering at the base. Avoid overhead watering after leaves die back.
Overwatered: soft, mushy bulbs at harvest; basal plate rot. Underwatered: small bulbs, thin necks.
Prefers top-watering — Top-water at the soil surface — keep the necks and crowns as dry as possible to prevent basal rot.
Temperature tolerance
60–75°F (15–24°C) during growth
40–60°F (4–15°C)
Hardneck garlic, shallots, and daffodils need a cold winter to bulb properly. Tender bulbs (dahlia, gladiolus) must be lifted in cold zones.
Container growing
Yes — great in containers
8+ in deep, wide enough to space bulbs 2–3× their diameter
Deep pot for tulips and daffodils; shallow bowls for crocus.
Detailed harvesting
For garlic and onion: dig when the bottom 3 leaves brown and top leaves still stand. Loosen with a fork, don't yank. Cure whole plants 2–3 weeks in a warm, airy, shaded spot.
Post-harvest storage & preservation
After curing, trim tops and roots. Store hardneck garlic 4–6 months, softneck 8+ months in a cool (50–60°F), dry, dark spot with airflow. Never in the fridge.
Culinary, medicinal & other uses
Culinary staple (allium bulbs), cut flowers (tulip, daffodil, lily), forced blooms indoors, or perennial garden color.
Medicinal or traditional uses are shared for interest only — this is not medical advice. Consult a qualified professional before using any plant medicinally.
Seed saving
Propagate by offset bulblets, not seed — bulbs mature much faster from a clove/bulb than from seed.
Not applicable when replanting clones. Cross-pollinated seed rarely comes true.
Save the biggest, firmest bulbs each year and replant. Over generations you build a locally-adapted strain.
Your zone's planting calendar
Pick your USDA hardiness zone and we'll estimate the key dates for crocus in your area. These are regional averages — always check your own last-frost forecast before sowing.
From your kitchen — grow crocus from what you already have
Bulbs propagate from offsets and bulblets, not seed. Every year the parent bulb makes more of itself underground.
- 1At harvest or dormancy, lift the clump and gently split off the smaller side-bulbs.
- 2Cure the bulbs 2–3 weeks in a warm airy spot until the necks are dry.
- 3Save the biggest for eating and the medium-sized ones for replanting.
- 4Replant at the recommended time for this crop, point-up, at the depth listed above.
Storage: Bulb strains adapt to your garden year over year — the older your stock, the better it grows.
My Crocus notes
Crocus seeds on hand
Track packets and loose seeds you already have. Private to your account.
Par level — leave at 0 for no alert. Anything below par shows on Seed Starting and your shopping list.
Order more seeds
Running low? Reorder from one of these seed stores.
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