Repotting guide

When & how to repot Mother of thousands (Kalanchoe daigremontiana)

Also called mother of thousands, devil's backbone, Mexican hat plant, alligator plant, mother-in-law plant.

More about mother of thousands

About Mother of thousands

Kalanchoe daigremontiana · also called mother of thousands, devil's backbone · houseplant

Mother of thousands is a Madagascan succulent that lines its leaf edges with tiny plantlets, each ready to root where it falls. It is easy to grow but toxic: the ASPCA lists Kalanchoe as toxic to cats and dogs, and the dropped plantlets are a real pet and child hazard.

Mature size: 0.5-1 m (about 18-36 in) tall indoors, with a narrow upright spread of 0.1-0.5 m

Watch for — Soft, mushy stem or yellowing base (root rot): Overwatering or a pot without drainage suffocates the roots and rots the crown.

How to tell mother of thousands needs repotting

Repotting on a calendar is less reliable than reading the plant. For mother of thousands, 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 mother of thousands

Every 2–3 years, into bone-dry mix. Mother of thousands's growth habit — upright, usually single-stemmed succulent with fleshy, grey-green, brown-mottled lance-shaped leaves edged with plantlets — sets the pace. Mother of thousands is a Madagascan succulent that lines its leaf edges with tiny plantlets, each ready to root where it falls. It is easy to grow but toxic: the ASPCA lists Kalanchoe as toxic to cats and dogs, and the dropped plantlets are a real pet and child hazard.

What size pot to step mother of thousands up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Mother of thousands 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 mother of thousands

Spring or summer, while mother of thousands 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 mother of thousands

Repot dry. Do not water mother of thousands 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 mother of thousands 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 mother of thousands 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 mother of thousands

Mother of thousands wants free-draining cactus or succulent mix. Loam-based compost cut with sharp sand, grit or perlite. A pot with drainage holes is essential to prevent waterlogging and root rot. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting mother of thousands — frequently asked questions

How often should you repot mother of thousands?

Every 2–3 years, into bone-dry mix for mother of thousands. Repot mother of thousands 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 mother of thousands need?

When is the best time of year to repot mother of thousands?

Should you water mother of thousands after repotting?

No — not straight away. Repot mother of thousands 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 mother of thousands after repotting?

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