Repotting guide

When & how to repot Crassula Falcata (Crassula falcata)

Also called propeller plant, airplane plant, scarlet paintbrush.

More about crassula falcata

About Crassula Falcata

Crassula falcata · also called propeller plant, airplane plant · houseplant

Crassula falcata is a striking South African succulent prized for its grey-green, sickle-shaped leaves stacked like propeller blades and dense, scarlet flower clusters in summer. It thrives in bright light and fast-draining gritty soil, stores water in fleshy leaves, and tolerates neglect far better than overwatering. A compact, sculptural windowsill plant.

Mature size: Around 30-45 cm tall and wide indoors over several years.

Watch for — Root rot from overwatering: Soft, translucent or blackened stems and leaves signal too-frequent watering or poor drainage. Let soil dry fully and use a gritty mix in a draining pot.

How to tell crassula falcata needs repotting

Repotting on a calendar is less reliable than reading the plant. For crassula falcata, 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 crassula falcata

Every 2–3 years, into bone-dry mix. Crassula Falcata's growth habit — slow-growing, clump-forming succulent with leaves arranged in opposite, overlapping rosettes resembling propeller blades; offsets at the base over time. — sets the pace. Crassula falcata is a striking South African succulent prized for its grey-green, sickle-shaped leaves stacked like propeller blades and dense, scarlet flower clusters in summer. It thrives in bright light and fast-draining gritty soil, stores water in fleshy leaves, and tolerates neglect far better than overwatering. A compact, sculptural windowsill plant.

What size pot to step crassula falcata up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Crassula Falcata 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 crassula falcata

Spring or summer, while crassula falcata 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 crassula falcata

Repot dry. Do not water crassula falcata 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 gritty, fast-draining cactus/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 crassula falcata 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 crassula falcata 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 crassula falcata

Crassula Falcata wants gritty, fast-draining cactus/succulent mix. Use a cactus and succulent blend cut with extra perlite, pumice or coarse sand for sharp drainage. A terracotta pot with a drainage hole helps the roots dry quickly. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting crassula falcata — frequently asked questions

How often should you repot crassula falcata?

Every 2–3 years, into bone-dry mix for crassula falcata. Repot crassula falcata every 2–3 years into a snug pot of gritty, fast-draining cactus/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 crassula falcata need?

When is the best time of year to repot crassula falcata?

Should you water crassula falcata after repotting?

No — not straight away. Repot crassula falcata 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 crassula falcata after repotting?

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