Repotting guide

When & how to repot Paul Robeson Tomato (Solanum lycopersicum 'Paul Robeson')

Also called Paul Robeson tomato, black heirloom tomato.

More about paul robeson tomato

About Paul Robeson Tomato

Solanum lycopersicum 'Paul Robeson' · also called Paul Robeson tomato, black heirloom tomato · edible

'Paul Robeson' is a celebrated Russian heirloom 'black' tomato bearing dusky brick-red fruit with smoky, rich, sweet-tart flavour. An indeterminate beefsteak type, it needs full sun, staking and a warm season. ASPCA lists the tomato plant as toxic to pets, though the ripe fruit itself is non-toxic and famously flavourful.

Mature size: 1.5-2.4 m tall on supports as a cordon; spreads roughly 45-60 cm.

How to tell paul robeson tomato needs repotting

Repotting on a calendar is less reliable than reading the plant. For paul robeson tomato, 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 paul robeson tomato 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 paul robeson tomato

Pot on seedlings as they grow; not a perennial repot. Paul Robeson Tomatois grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Indeterminate cordon vine that fruits continuously until frost; requires sturdy staking or caging, regular tying-in and side-shoot removal..

What size pot to step paul robeson tomato up to

Pot paul robeson tomato 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 paul robeson tomato

Pot paul robeson tomato 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 paul robeson tomato

Pot on before it is root-bound. Check paul robeson tomato 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, well-drained 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 paul robeson tomato 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 paul robeson tomato

Paul Robeson Tomato wants rich, well-drained loam, ph 6.0-6.8. A heavy feeder that wants fertile soil enriched with compost or rotted manure. Combine good drainage with steady moisture for full-flavoured, well-coloured fruit. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting paul robeson tomato — frequently asked questions

How often should you repot paul robeson tomato?

Pot on seedlings as they grow; not a perennial repot for paul robeson tomato. Paul Robeson Tomato is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into rich, well-drained 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 paul robeson tomato need?

When is the best time of year to repot paul robeson tomato?

Can you put paul robeson tomato straight into a much bigger pot?

No. Even a fast-growing paul robeson tomato 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 paul robeson tomato after repotting?

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