Repotting guide

When & how to repot Reko's Pincushion (Mammillaria rekoi)

Also called Reko Mammillaria, Reko Cactus.

More about reko's pincushion

About Reko's Pincushion

Mammillaria rekoi · also called Reko Mammillaria, Reko Cactus · houseplant

Mammillaria rekoi is a striking Mexican pincushion cactus bearing stout, distinctively coloured spines and producing rings of bright carmine-pink flowers in late spring. Named after Mexican botanist Blas Pablo Reko, it is a collector's species that rewards careful husbandry. Best suited to experienced growers who can meet its need for ample sun and sharp drainage. Not toxic to pets.

Mature size: 8-12 cm tall, 6-10 cm wide

Watch for — Root rot: Overwatering or winter moisture is fatal. Water only in the growing season and keep bone dry in winter.

How to tell reko's pincushion needs repotting

Repotting on a calendar is less reliable than reading the plant. For reko's pincushion, watch for these signs:

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

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 reko's pincushion

Every 2–3 years, into bone-dry mix. Reko's Pincushion's growth habit — solitary or slowly clustering cylindrical-globose cactus — sets the pace. Mammillaria rekoi is a striking Mexican pincushion cactus bearing stout, distinctively coloured spines and producing rings of bright carmine-pink flowers in late spring. Named after Mexican botanist Blas Pablo Reko, it is a collector's species that rewards careful husbandry. Best suited to experienced growers who can meet its need for ample sun and sharp drainage. Not toxic to pets.

What size pot to step reko's pincushion up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Reko's Pincushion stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

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 reko's pincushion

Spring or summer, while reko's pincushion is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting reko's pincushion

Repot dry. Do not water reko's pincushion for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty free-draining cactus or succulent mix ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set reko's pincushion at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep reko's pincushion completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for reko's pincushion

Reko's Pincushion wants free-draining cactus or succulent mix. Use a sharply draining mix — commercial cactus compost with added perlite or fine grit at a 1:1 ratio is ideal. Shallow terracotta pots help prevent moisture retention. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting reko's pincushion — frequently asked questions

How often should you repot reko's pincushion?

Every 2–3 years, into bone-dry mix for reko's pincushion. Repot reko's pincushion every 2–3 years into a snug pot of free-draining cactus or succulent mix, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does reko's pincushion need?

When is the best time of year to repot reko's pincushion?

Should you water reko's pincushion after repotting?

No — not straight away. Repot reko's pincushion into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise reko's pincushion after repotting?

Not immediately. Wait about 3 weeks after repotting reko's pincushion. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.