Repotting guide

When & how to repot Aloe Castillon (Aloe castilloniae)

Also called Castillon aloe.

More about aloe castillon

About Aloe Castillon

Aloe castilloniae · also called Castillon aloe · houseplant

Aloe castilloniae is a striking dwarf Madagascan aloe with stacked, recurved olive-to-reddish leaves densely covered in white bristly spines along the margins and keel. It forms low sprawling stems and prized branched coral-red flower clusters. A sought-after collector's species, it stays compact, loves heat and bright light, and needs scrupulously sharp drainage.

Mature size: Stems stay short, forming clumps roughly 20-40 cm across and 15-25 cm tall.

How to tell aloe castillon needs repotting

Repotting on a calendar is less reliable than reading the plant. For aloe castillon, 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 aloe castillon

Every 2–3 years, into bone-dry mix. Aloe Castillon's growth habit — dwarf, sprawling and slowly branching, forming low clusters of short bristly stems. — sets the pace. Aloe castilloniae is a striking dwarf Madagascan aloe with stacked, recurved olive-to-reddish leaves densely covered in white bristly spines along the margins and keel. It forms low sprawling stems and prized branched coral-red flower clusters. A sought-after collector's species, it stays compact, loves heat and bright light, and needs scrupulously sharp drainage.

What size pot to step aloe castillon up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Aloe Castillon 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 aloe castillon

Spring or summer, while aloe castillon 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 aloe castillon

Repot dry. Do not water aloe castillon 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 very gritty, fast-draining 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 aloe castillon 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 aloe castillon 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 aloe castillon

Aloe Castillon wants very gritty, fast-draining succulent mix. A mineral-heavy blend with abundant pumice or perlite. Free drainage and warmth together prevent winter rot in this heat-loving aloe. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting aloe castillon — frequently asked questions

How often should you repot aloe castillon?

Every 2–3 years, into bone-dry mix for aloe castillon. Repot aloe castillon every 2–3 years into a snug pot of very gritty, fast-draining 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 aloe castillon need?

When is the best time of year to repot aloe castillon?

Should you water aloe castillon after repotting?

No — not straight away. Repot aloe castillon 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 aloe castillon after repotting?

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