Soil & potting mix

Best soil for Kalanchoe (Kalanchoe blossfeldiana)

Also called flaming Katy, Christmas kalanchoe, Madagascar widow’s thrill.

About Kalanchoe

Kalanchoe blossfeldiana · also called flaming Katy, Christmas kalanchoe · flowering

Kalanchoe is a compact succulent from Madagascar grown for its clusters of small red, pink, yellow or orange flowers. It blooms in winter and lasts for weeks, making it a popular gift plant. Toxic to pets.

Kalanchoe blossfeldiana (Flaming Katy) is a succulent native to Madagascar, adapted to bright, warm conditions with marked dry periods, which is why it stores water in its thick, fleshy leaves.

Use a gritty, fast-draining cactus or succulent mix; standard moisture-retentive potting soil holds too much water around the shallow roots of this drought-adapted plant.

Preferred mix: Free-draining cactus or succulent mix

Sources: aspca.org, plants.ces.ncsu.edu, hgic.clemson.edu

Why kalanchoe needs this mix

Kalanchoe stores water in its leaves and stems, so it wants a free-draining, gritty mix that dries out fully between waterings — not a moisture-holding one.

Kalanchoe carries its own water supply in its thick tissue, so the soil's job is to drain fast and then get out of the way.
Its roots are adapted to short wet spells followed by long dry ones — a mix that stays damp removes the dry phase they depend on.
A gritty mix also keeps the plant compact and well-coloured rather than soft, leggy and prone to collapse.

For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.

What goes wrong with the wrong mix

The wrong soil is one of the most common reasons kalanchoe struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:

Standard potting compost on its own stays wet far too long for kalanchoe; the lower leaves and stem base go soft and translucent first.
Big plastic pots full of dense mix hold a wet core long after the surface looks dry — that hidden wet zone is where rot starts.
Anything sold as "moisture control" is the opposite of what this plant wants.

Treating kalanchoe like a leafy houseplant and using plain compost. It needs at least half its volume as grit, perlite or pumice to survive long term.

pH — does it matter for kalanchoe?

pH is not a concern for kalanchoe — anything from mildly acidic to neutral (6.0-7.0) works. Get the drainage right and pH looks after itself.

If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.

DIY mix vs a bagged one

A good bagged "cactus and succulent" mix works for kalanchoe if you add roughly 30-50% extra perlite or grit. Mixing your own from the ratio above gives you full control of how fast it dries.

Drainage and the pot

Use a pot with a drainage hole and empty the saucer within minutes of watering. Terracotta is more forgiving than glazed or plastic because it dries the rootball faster.

This mix decomposes slowly, so kalanchoe only needs repotting every 2-3 years — mainly to refresh the grit and check the roots are firm and pale. When the time comes, our repotting guide for kalanchoe covers the timing and technique step by step.

Kalanchoe soil — frequently asked questions

What is the best soil mix for kalanchoe?

2 parts standard cactus or succulent compost : 1 part perlite or pumice : 1 part coarse grit or coarse sand. Kalanchoe carries its own water supply in its thick tissue, so the soil's job is to drain fast and then get out of the way.

Can I use normal potting soil for kalanchoe?

Standard potting compost on its own stays wet far too long for kalanchoe; the lower leaves and stem base go soft and translucent first. A good bagged "cactus and succulent" mix works for kalanchoe if you add roughly 30-50% extra perlite or grit. Mixing your own from the ratio above gives you full control of how fast it dries.

Does kalanchoe need a special pH?