Repotting guide

When & how to repot Patty Pan Squash (Cucurbita pepo 'Sunburst')

Also called patty pan squash, scallop squash, UFO squash.

More about patty pan squash

About Patty Pan Squash

Cucurbita pepo 'Sunburst' · also called patty pan squash, scallop squash · edible

Patty pan is a bushy summer squash grown for its small, scallop-edged fruits picked young at 5-8 cm. A fast, hungry, frost-tender annual, it crops heavily from a single plant given full sun, rich moist soil and regular picking. Harvest every few days to keep fruits tender and production rolling through summer.

Mature size: 60-90 cm tall and roughly 90 cm wide; fruits best eaten at 5-8 cm across.

How to tell patty pan squash needs repotting

Repotting on a calendar is less reliable than reading the plant. For patty pan squash, 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 patty pan squash 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 patty pan squash

Pot on seedlings as they grow; not a perennial repot. Patty Pan Squashis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Compact bushy annual with large lobed leaves; far less sprawling than trailing winter squash, suiting smaller beds and large containers..

What size pot to step patty pan squash up to

Pot patty pan squash 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 patty pan squash

Pot patty pan squash 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 patty pan squash

Pot on before it is root-bound. Check patty pan squash 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, fertile, free-draining loam, ph 6.0-6.8 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 patty pan squash 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 patty pan squash

Patty Pan Squash wants rich, fertile, free-draining loam, ph 6.0-6.8. Dig in plenty of well-rotted manure or compost before planting. A moisture-retentive but well-drained soil suits its heavy feeding and high water demand. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting patty pan squash — frequently asked questions

How often should you repot patty pan squash?

Pot on seedlings as they grow; not a perennial repot for patty pan squash. Patty Pan Squash is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into rich, fertile, free-draining loam, ph 6.0-6.8 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 patty pan squash need?

When is the best time of year to repot patty pan squash?

Can you put patty pan squash straight into a much bigger pot?

No. Even a fast-growing patty pan squash 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 patty pan squash after repotting?

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