Repotting guide

When & how to repot Ping Pong Purple globe amaranth (Gomphrena globosa 'Ping Pong Purple')

Also called Ping Pong Purple globe amaranth, Ping Pong Purple gomphrena.

More about ping pong purple globe amaranth

About Ping Pong Purple globe amaranth

Gomphrena globosa 'Ping Pong Purple' · also called Ping Pong Purple globe amaranth, Ping Pong Purple gomphrena · flowering

A compact, mounded globe amaranth bearing large, vivid purple spherical flowerheads on neat 30–40 cm plants. The 'Ping Pong' series is bred for uniformity, larger blooms, and exceptional heat and drought tolerance. Superb for edging, containers, and mixed borders; blooms freely from summer through frost without deadheading.

Mature size: 30–40 cm tall, 30–35 cm wide

Watch for — Crown rot in poorly drained containers: Compacted potting mix or containers without drainage holes can cause crown and root rot. Refresh potting mix annually and always use containers with drainage holes.

How to tell ping pong purple globe amaranth needs repotting

Repotting on a calendar is less reliable than reading the plant. For ping pong purple globe amaranth, 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 ping pong purple globe amaranth 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 ping pong purple globe amaranth

Pot on seedlings as they grow; not a perennial repot. Ping Pong Purple globe amaranthis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Compact, mounded, freely branching annual.

What size pot to step ping pong purple globe amaranth up to

Pot ping pong purple globe amaranth 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 ping pong purple globe amaranth

Pot ping pong purple globe amaranth 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 ping pong purple globe amaranth

Pot on before it is root-bound. Check ping pong purple globe amaranth 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 well-drained loam, sandy loam, or potting mix with added grit 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 ping pong purple globe amaranth 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 ping pong purple globe amaranth

Ping Pong Purple globe amaranth wants well-drained loam, sandy loam, or potting mix with added grit. Average, well-drained soil is ideal. Enrich very poor soils lightly with compost at planting. In containers, use a quality multipurpose compost blended with 20–30% horticultural grit to ensure free drainage. pH 5.5–7.0. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting ping pong purple globe amaranth — frequently asked questions

How often should you repot ping pong purple globe amaranth?

Pot on seedlings as they grow; not a perennial repot for ping pong purple globe amaranth. Ping Pong Purple globe amaranth is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into well-drained loam, sandy loam, or potting mix with added grit 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 ping pong purple globe amaranth need?

When is the best time of year to repot ping pong purple globe amaranth?

Can you put ping pong purple globe amaranth straight into a much bigger pot?

No. Even a fast-growing ping pong purple globe amaranth 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 ping pong purple globe amaranth after repotting?

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