Repotting guide

When & how to repot Torenia fournieri (Torenia fournieri)

Also called wishbone flower, bluewings, clown flower.

More about torenia fournieri

About Torenia fournieri

Torenia fournieri · also called wishbone flower, bluewings · flowering

Wishbone flower is a compact shade-tolerant annual grown for its two-lipped, snapdragon-like blooms in violet, blue, pink and white, named for the wishbone-shaped stamens inside. It flowers non-stop from summer to frost in partial shade, making it a reliable filler for borders, containers and hanging baskets in warm, humid weather.

Mature size: 15-30 cm tall and 15-23 cm wide, depending on series; trailing types spread wider in containers.

Watch for — Root rot and damping-off: Soggy, poorly drained soil rots roots and kills seedlings. Use well-draining mix and let the surface dry slightly between waterings.

How to tell torenia fournieri needs repotting

Repotting on a calendar is less reliable than reading the plant. For torenia fournieri, 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 torenia fournieri 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 torenia fournieri

Pot on seedlings as they grow; not a perennial repot. Torenia fournieriis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Bushy, mounding to slightly trailing annual that branches freely. Trailing and cascading series suit baskets, while upright forms mound neatly in beds. Self-cleaning, so deadheading is optional..

What size pot to step torenia fournieri up to

Pot torenia fournieri 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 torenia fournieri

Pot torenia fournieri 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 torenia fournieri

Pot on before it is root-bound. Check torenia fournieri 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, moist, well-draining loam 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 torenia fournieri 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 torenia fournieri

Torenia fournieri wants fertile, moist, well-draining loam. Prefers rich, humus-rich soil with steady moisture and good drainage. Slightly acidic to neutral pH suits it. Mix compost into beds and use a quality peat-based mix in containers. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting torenia fournieri — frequently asked questions

How often should you repot torenia fournieri?

Pot on seedlings as they grow; not a perennial repot for torenia fournieri. Torenia fournieri is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into fertile, moist, well-draining loam 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 torenia fournieri need?

When is the best time of year to repot torenia fournieri?

Can you put torenia fournieri straight into a much bigger pot?

No. Even a fast-growing torenia fournieri 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 torenia fournieri after repotting?

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