Repotting guide

When & how to repot King Henry Venus flytrap (Dionaea muscipula 'King Henry')

Also called King Henry Venus flytrap, King Henry flytrap, Giant Venus flytrap.

More about king henry venus flytrap

About King Henry Venus flytrap

Dionaea muscipula 'King Henry' · also called King Henry Venus flytrap, King Henry flytrap · houseplant

Bred by Don Elkins of Mesa Exotics specifically for massive size, 'King Henry' ranks among the top three largest Venus flytrap cultivars in cultivation. Traps reach up to 4.5 cm, borne on long upright petioles. A fast grower that matures in just two seasons. Like all flytraps it demands full sun, pure water, and a cool winter dormancy. Pet-safe per ASPCA.

Mature size: Rosette 15–25 cm wide; individual traps up to 4–4.5 cm long — among the largest in cultivation

Watch for — Clumping and crowding in pot: King Henry frequently produces multiple crowns from its tissue-culture origins. When the clump fills the pot, the largest traps shrink as resources are divided. Divide clumps in early spring during dormancy break, ensuring each division has several white roots.

How to tell king henry venus flytrap needs repotting

Repotting on a calendar is less reliable than reading the plant. For king henry venus flytrap, watch for these signs:

Roots spiralling thickly out of the drainage holes or pushing the whole plant up out of the pot.
The pot is so packed that water runs straight through in seconds and barely wets the soil.
It has split a plastic pot, or the rootball is a solid mass with almost no soil left when you slide it out.
Growth and (for king henry venus flytrap) flowering have clearly stalled despite good light and feeding — but remember this plant likes being snug, so a little crowding alone is not a reason to repot.

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 king henry venus flytrap

Only every 2–4 years, when genuinely crowded. King Henry Venus flytrap is one of the plants that genuinely prefers a snug pot — it grows and flowers better with its roots a little restricted, so resist the urge to repot it on schedule. Upright rosette-forming perennial; frequently clumps due to tissue-culture origin; traps borne on tall, narrow upright petioles.

What size pot to step king henry venus flytrap up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. King Henry Venus flytrap positively prefers a snug pot: it flowers and grows better when the roots are a little restricted. The single biggest repotting mistake here is over-potting — dropping king henry venus flytrap into a pot two or three sizes up. All that surplus soil holds water the small root system cannot use, stays cold and wet, and rots the roots within weeks. When in doubt, choose the smaller pot.

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 king henry venus flytrap

Early spring, just as new growth restarts, is the ideal window for king henry venus flytrap. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting king henry venus flytrap

Confirm it actually needs it. Slide king henry venus flytrap out and check the roots. Only continue if it is genuinely packed — this plant prefers a snug pot, so if there is still soil and room, put it straight back.
Pick a pot only one size up. Choose a pot just 2–3 cm wider with good drainage. Resist anything bigger; over-potting is the main killer here.
Ease it out gently. Water lightly the day before, then tip king henry venus flytrap out, supporting the base. Tease the outer roots free only enough to stop them circling.
Repot at the same depth. Add a layer of fresh nutrient-poor acidic carnivore mix, set the plant so the soil line sits exactly where it did before, and backfill around the sides, firming lightly.
Settle it in. Water once to settle the soil, then let it sit. Hold off on more water until the top of the soil dries — fresh soil around a small root system stays wet for a while.

Aftercare

Because the new soil holds more water than the old crammed rootball did, ease right back on watering — let the top of the soil dry before you water king henry venus flytrap again, or you will rot the roots in the very pot you just moved it to. Keep it out of harsh direct sun for a fortnight. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for king henry venus flytrap

King Henry Venus flytrap wants nutrient-poor acidic carnivore mix. A 1:1 blend of long-fibre sphagnum moss and perlite, or pure sphagnum, in a deep pot (12–15 cm) to support its substantial root system. No added nutrients. Repot annually in spring; the cultivar frequently produces clumps from its tissue-culture origins that can be divided at this time. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting king henry venus flytrap — frequently asked questions

How often should you repot king henry venus flytrap?

Only every 2–4 years, when genuinely crowded for king henry venus flytrap. Only repot king henry venus flytrap every 2–4 years, and only when it is genuinely root-bound — it flowers and grows best slightly crowded. Step up just one pot size in spring using nutrient-poor acidic carnivore mix. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does king henry venus flytrap need?

When is the best time of year to repot king henry venus flytrap?

Does king henry venus flytrap like to be root-bound?

Yes — king henry venus flytrap genuinely flowers and grows best when slightly pot-bound, so do not rush to repot it. The mistake to avoid is over-potting into a much larger pot: the excess soil stays wet, the roots cannot use it, and the plant rots. Only repot every few years and only one snug size up.

Should you fertilise king henry venus flytrap after repotting?

Not immediately. Wait about 4 weeks after repotting king henry venus flytrap. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.