Repotting guide

When & how to repot Alaska Mix Nasturtium (Tropaeolum majus)

Also called Nasturtium, Garden Nasturtium, Alaska Nasturtium.

More about alaska mix nasturtium

About Alaska Mix Nasturtium

Tropaeolum majus · also called Nasturtium, Garden Nasturtium · flowering

A bushy, mounding nasturtium with distinctive cream-marbled foliage and brightly coloured edible flowers in orange, red, and yellow. Reaches 25–35 cm tall. Thrives in poor soil and full sun. Flowers and leaves are edible with a peppery flavour. Considered mildly toxic to cats and dogs in large quantities.

Mature size: 25–35 cm tall and wide

How to tell alaska mix nasturtium needs repotting

Repotting on a calendar is less reliable than reading the plant. For alaska mix 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 alaska mix 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 alaska mix nasturtium

Pot on seedlings as they grow; not a perennial repot. Alaska Mix 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.

What size pot to step alaska mix nasturtium up to

Pot alaska mix 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 alaska mix nasturtium

Pot alaska mix 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 alaska mix nasturtium

Pot on before it is root-bound. Check alaska mix 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 moderately fertile, well-draining loam or sandy soil 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 alaska mix 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 alaska mix nasturtium

Alaska Mix Nasturtium wants poor to moderately fertile, well-draining loam or sandy soil. Unusually, nasturtiums bloom most freely in lean, poor soil. Rich compost-amended beds promote foliage at the expense of flowers. pH 6.0–7.5 suitable. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting alaska mix nasturtium — frequently asked questions

How often should you repot alaska mix nasturtium?

Pot on seedlings as they grow; not a perennial repot for alaska mix nasturtium. Alaska Mix 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 moderately fertile, well-draining loam or sandy soil 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 alaska mix nasturtium need?

When is the best time of year to repot alaska mix nasturtium?

Can you put alaska mix nasturtium straight into a much bigger pot?

No. Even a fast-growing alaska mix 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 alaska mix nasturtium after repotting?

Not immediately. Wait about 1 week after repotting alaska mix 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.