Repotting guide

When & how to repot Water Spinach 'Bangkok Large Leaf' (Ipomoea aquatica 'Bangkok Large Leaf')

Also called Bangkok large leaf water spinach, kangkong, morning glory vegetable.

More about water spinach 'bangkok large leaf'

About Water Spinach 'Bangkok Large Leaf'

Ipomoea aquatica 'Bangkok Large Leaf' · also called Bangkok large leaf water spinach, kangkong · edible

'Bangkok Large Leaf' is a broad-leaved kangkong grown for its tender, fast-growing shoots and large leaves used in Southeast Asian stir-fries. A semi-aquatic, heat-loving morning glory relative, it thrives in warmth and constant moisture or shallow water, cropping in 4-6 weeks and regrowing repeatedly after cut-and-come-again harvesting through the summer.

Mature size: Trailing stems 1-3 m; leaves up to 15 cm; harvested young at 20-30 cm shoots

How to tell water spinach 'bangkok large leaf' needs repotting

Repotting on a calendar is less reliable than reading the plant. For water spinach 'bangkok large leaf', 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 water spinach 'bangkok large leaf' 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 water spinach 'bangkok large leaf'

Pot on seedlings as they grow; not a perennial repot. Water Spinach 'Bangkok Large Leaf'is grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Trailing or floating semi-aquatic vine with hollow stems and broad, arrow-shaped leaves, rooting at nodes and regrowing vigorously after each cut..

What size pot to step water spinach 'bangkok large leaf' up to

Pot water spinach 'bangkok large leaf' 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 water spinach 'bangkok large leaf'

Pot water spinach 'bangkok large leaf' 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 water spinach 'bangkok large leaf'

Pot on before it is root-bound. Check water spinach 'bangkok large leaf' 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 rich, water-retentive loam or muddy soil, 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 water spinach 'bangkok large leaf' 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 water spinach 'bangkok large leaf'

Water Spinach 'Bangkok Large Leaf' wants rich, water-retentive loam or muddy soil, ph 6.0-7.0. Heavy, fertile, moisture-holding soil suits it best; can also be grown hydroponically or in flooded trays. Constant wetness, not drainage, is the goal. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting water spinach 'bangkok large leaf' — frequently asked questions

How often should you repot water spinach 'bangkok large leaf'?

Pot on seedlings as they grow; not a perennial repot for water spinach 'bangkok large leaf'. Water Spinach 'Bangkok Large Leaf' is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into rich, water-retentive loam or muddy soil, 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 water spinach 'bangkok large leaf' need?

When is the best time of year to repot water spinach 'bangkok large leaf'?

Can you put water spinach 'bangkok large leaf' straight into a much bigger pot?

No. Even a fast-growing water spinach 'bangkok large leaf' 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 water spinach 'bangkok large leaf' after repotting?

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