Repotting guide

When & how to repot Crocus tommasinianus 'Ruby Giant' (Crocus tommasinianus 'Ruby Giant')

Also called Ruby Giant crocus, Tommie crocus, purple Tommasinianus crocus.

More about crocus tommasinianus 'ruby giant'

About Crocus tommasinianus 'Ruby Giant'

Crocus tommasinianus 'Ruby Giant' · also called Ruby Giant crocus, Tommie crocus · flowering

Crocus tommasinianus 'Ruby Giant' is an early, slender 'Tommie' crocus bearing rich reddish-purple, silvery-backed flowers in late winter to early spring. Sterile but vigorous, it spreads by offsets to naturalise quickly in lawns and gravel. Plant corms 7-10 cm deep in autumn in full sun and free-draining soil; it is famously squirrel-resistant compared with larger Dutch crocus.

Mature size: 8-10 cm tall, clumps spreading rapidly to cover broad areas over a few seasons

Watch for — Flowers closed in dull weather: Blooms open only in sun and warmth, staying shut on grey late-winter days. Plant in the sunniest available spot for the longest display.

How to tell crocus tommasinianus 'ruby giant' needs repotting

Repotting on a calendar is less reliable than reading the plant. For crocus tommasinianus 'ruby giant', watch for these signs:

Flowering has tailed off year on year and the clump has become congested and overcrowded.
Lots of leaf and few flowers — a classic sign that crocus tommasinianus 'ruby giant' bulbs or tubers need lifting and dividing.
Bulbs visibly bursting the pot or pushing each other to the surface.
It is the natural dormancy window (foliage yellowed and died back) — the only safe time to lift and split.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot crocus tommasinianus 'ruby giant'

Lift and divide every 3–4 years once clumps congest. Rather than a true repot, crocus tommasinianus 'ruby giant' is lifted and divided once the clump congests and flowering drops off. Slender, early-flowering geophyte from a small corm with very fine grassy leaves and delicate goblet blooms. A strong, fast naturaliser spreading mainly by offsets to form extensive carpets..

What size pot to step crocus tommasinianus 'ruby giant' up to

Pot size matters less than depth and spacing here. When you replant crocus tommasinianus 'ruby giant', set the bulbs or tubers at the correct depth (a rough guide: two to three times their own height of soil over the top) and space them so they are not touching. A wide, shallow pot suits a clump better than a tall narrow one.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot crocus tommasinianus 'ruby giant'

The only safe window is dormancy: wait until the foliage has yellowed and died back naturally, lift and divide then, and replant before or at the start of the next growing season. Disturbing crocus tommasinianus 'ruby giant' in full growth or flower sets it back badly.

Step-by-step: repotting crocus tommasinianus 'ruby giant'

Wait for dormancy. Let crocus tommasinianus 'ruby giant' foliage yellow and die back completely. Lifting while it is in growth wastes the energy it is storing for next year.
Lift carefully. Loosen the soil well away from the bulbs/tubers with a fork and ease the whole clump out without spearing them.
Separate the offsets. Gently pull the clump apart into individual bulbs or tubers. Keep only firm, healthy, blemish-free ones.
Replant at the right depth. Reset them in fresh light, free-draining loam, sandy or gritty soil, neutral to alkaline at the correct depth and spacing — not touching — so each has room to bulk up.
Water in and rest. Water once to settle them, then keep on the dry side until growth resumes. Do not feed until leaves are actively growing.

Aftercare

After replanting crocus tommasinianus 'ruby giant', keep the soil barely moist — not wet — until shoots appear; bulbs and tubers rot in cold, saturated soil. Once leaves are growing strongly, resume normal watering. Hold off feeding until the plant is in active growth again.

The right soil mix for crocus tommasinianus 'ruby giant'

Crocus tommasinianus 'Ruby Giant' wants light, free-draining loam, sandy or gritty soil, neutral to alkaline. Tolerates poorer, drier ground better than Dutch crocus and naturalises happily in thin grass and gravel. Avoid heavy, wet clay; add grit if drainage is poor. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting crocus tommasinianus 'ruby giant' — frequently asked questions

How often should you repot crocus tommasinianus 'ruby giant'?

Lift and divide every 3–4 years once clumps congest for crocus tommasinianus 'ruby giant'. Crocus tommasinianus 'Ruby Giant' is lifted and divided, not "repotted". Every 3–4 years, once the foliage has died back and it is dormant, lift the clump, separate the offsets, and replant at the correct depth in light, free-draining loam, sandy or gritty soil, neutral to alkaline. Crowding, not pot size, is what reduces flowering over time.

What size pot does crocus tommasinianus 'ruby giant' need?

When is the best time of year to repot crocus tommasinianus 'ruby giant'?

Do you "repot" crocus tommasinianus 'ruby giant', or lift and divide it?

You lift and divide it. Crocus tommasinianus 'Ruby Giant' grows from bulbs or tubers, so instead of repotting you wait for dormancy, lift the congested clump, separate the healthy offsets, and replant them at the right depth and spacing. Doing this every 3–4 years restores flowering.

Should you fertilise crocus tommasinianus 'ruby giant' after repotting?

Hold off feeding crocus tommasinianus 'ruby giant' until it is in active growth again. Fresh soil already carries enough nutrients to get it re-established, and feeding disturbed roots too soon does more harm than good.