Repotting guide

When & how to repot Tongue of Fire Bean (Phaseolus vulgaris 'Tongue of Fire')

Also called Tongue of Fire bean, borlotti bean, speckled shell bean.

More about tongue of fire bean

About Tongue of Fire Bean

Phaseolus vulgaris 'Tongue of Fire' · also called Tongue of Fire bean, borlotti bean · edible

'Tongue of Fire' is an Italian borlotti-type bean grown mainly for its plump, cream-and-red flecked shelling beans, though young pods can be eaten as snaps. Available in bush and semi-runner forms, it needs full sun, warm soil and steady moisture. Beans are shelled fresh or dried for soups and stews.

Mature size: Bush forms 45-60 cm tall; semi-runner strains reach 1-1.5 m on supports

How to tell tongue of fire bean needs repotting

Repotting on a calendar is less reliable than reading the plant. For tongue of fire bean, watch for these signs:

Roots circling the bottom of the module or pot, or poking out of the drainage holes.
The seedling dries out within a day and growth has visibly stalled.
Roots are white and matted in a tight spiral when you tip the plant out.
It has outgrown its current container for the stage of the season — pot tongue of fire bean on before it becomes hard root-bound.

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 tongue of fire bean

Pot on seedlings as they grow; not a perennial repot. Tongue of Fire Beanis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Bush to semi-runner habit depending on strain; bush forms are compact and self-supporting, semi-runners benefit from short supports or netting..

What size pot to step tongue of fire bean up to

Pot tongue of fire bean on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check.

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 tongue of fire bean

Pot tongue of fire bean on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.

Step-by-step: repotting tongue of fire bean

Pot on before it is root-bound. Check tongue of fire bean regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
Step up one or two sizes. Choose the next container up — not a giant one. Cold, wet, unused soil around a small root system stalls seedlings.
Knock it out gently. Support the stem, tip the pot, and ease the rootball out without breaking it. A little teasing of circled roots at the base is fine.
Pot into rich mix. Set it into fresh fertile, free-draining loam, ph 6.0-7.0 at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.

Aftercare

Water tongue of fire bean in well and keep it in bright light; a freshly potted-on seedling can wilt for a day while roots settle, so do not overcompensate by drowning it. Do not fertilise for about 1 week — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for tongue of fire bean

Tongue of Fire Bean wants fertile, free-draining loam, ph 6.0-7.0. Moisture-retentive but well-drained soil with compost worked in. As a nitrogen-fixer it needs little extra nitrogen; over-feeding delays the pods you are growing it for. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting tongue of fire bean — frequently asked questions

How often should you repot tongue of fire bean?

Pot on seedlings as they grow; not a perennial repot for tongue of fire bean. Tongue of Fire Bean is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into fertile, free-draining loam, ph 6.0-7.0 so the roots never circle the cell, ending in a large final container. A root-bound transplant stalls and never fully recovers.

What size pot does tongue of fire bean need?

When is the best time of year to repot tongue of fire bean?

Can you put tongue of fire bean straight into a much bigger pot?

No. Even a fast-growing tongue of fire bean should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.

Should you fertilise tongue of fire bean after repotting?

Not immediately. Wait about 1 week after repotting tongue of fire bean. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.