Repotting guide

When & how to repot Dwarf nasturtium (Tropaeolum minus)

Also called Dwarf nasturtium, Indian cress, Nasturtium.

More about dwarf nasturtium

About Dwarf nasturtium

Tropaeolum minus · also called Dwarf nasturtium, Indian cress · edible

Dwarf nasturtium is a compact, fast-growing annual with round, lily-pad-like leaves and vivid orange, yellow, or red flowers — both entirely edible with a peppery flavour. It thrives in poor to average soil with full sun and minimal watering. Avoid over-fertilising, which produces lush leaves at the expense of flowers.

Mature size: 20–35 cm tall (8–14 in), 25–40 cm spread (10–16 in)

How to tell dwarf nasturtium needs repotting

Repotting on a calendar is less reliable than reading the plant. For dwarf nasturtium, 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 dwarf nasturtium 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 dwarf nasturtium

Pot on seedlings as they grow; not a perennial repot. Dwarf nasturtiumis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Compact, mounding annual with round, waxy, peltate leaves on trailing or bushy stems; flowers held above foliage on long stalks.

What size pot to step dwarf nasturtium up to

Pot dwarf nasturtium 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 dwarf nasturtium

Pot dwarf nasturtium 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 dwarf nasturtium

Pot on before it is root-bound. Check dwarf nasturtium 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 poor to average, well-drained loam or sandy loam, ph 6.0–7.5 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 dwarf nasturtium 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 dwarf nasturtium

Dwarf nasturtium wants poor to average, well-drained loam or sandy loam, ph 6.0–7.5. Thrives in poor, lean soil — this is one of the few annuals that flowers better without rich compost or fertiliser. Overly fertile soil produces lush, dark green leaves but very few flowers. Good drainage is essential; avoid heavy clay. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting dwarf nasturtium — frequently asked questions

How often should you repot dwarf nasturtium?

Pot on seedlings as they grow; not a perennial repot for dwarf nasturtium. Dwarf nasturtium is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into poor to average, well-drained loam or sandy loam, ph 6.0–7.5 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 dwarf nasturtium need?

When is the best time of year to repot dwarf nasturtium?

Can you put dwarf nasturtium straight into a much bigger pot?

No. Even a fast-growing dwarf nasturtium 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 dwarf nasturtium after repotting?

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