Repotting guide

When & how to repot Cocoon Plant (Senecio haworthii)

Also called Cocoon Plant, Woolly Senecio, Snow Cocoon.

More about cocoon plant

About Cocoon Plant

Senecio haworthii · also called Cocoon Plant, Woolly Senecio · houseplant

A distinctive South African dwarf succulent with cylindrical leaves densely wrapped in white woolly hairs, giving each leaf the appearance of a silky cocoon. Grows upright to about 30 cm. The white felt dramatically reflects intense sunlight and reduces water loss. Needs bright light, sharp drainage, and minimal water. Toxic to pets.

Mature size: 20–30 cm (8–12 in) tall; 15–25 cm (6–10 in) wide

Watch for — Stretching and loss of compact form: Caused by low light levels. Stems elongate and gaps appear between leaves. Move to the brightest available window or supplement with a grow light placed 20–30 cm above the plant.

How to tell cocoon plant needs repotting

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

Every 2–3 years, into bone-dry mix. Cocoon Plant's growth habit — upright, clump-forming dwarf succulent with woolly-coated cylindrical leaves; branching at the base to form small shrublets — sets the pace. A distinctive South African dwarf succulent with cylindrical leaves densely wrapped in white woolly hairs, giving each leaf the appearance of a silky cocoon. Grows upright to about 30 cm. The white felt dramatically reflects intense sunlight and reduces water loss. Needs bright light, sharp drainage, and minimal water. Toxic to pets.

What size pot to step cocoon plant up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Cocoon Plant 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 cocoon plant

Spring or summer, while cocoon plant 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 cocoon plant

Repot dry. Do not water cocoon plant 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, extremely well-draining cactus and 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 cocoon plant 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 cocoon plant 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 cocoon plant

Cocoon Plant wants gritty, extremely well-draining cactus and succulent mix. Blend standard cactus mix with 40–50% perlite or coarse horticultural grit. The woolly hairs trap moisture against leaves, so the growing medium must drain extremely quickly. Terracotta pots are strongly recommended. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting cocoon plant — frequently asked questions

How often should you repot cocoon plant?

Every 2–3 years, into bone-dry mix for cocoon plant. Repot cocoon plant every 2–3 years into a snug pot of gritty, extremely well-draining cactus and 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 cocoon plant need?

When is the best time of year to repot cocoon plant?

Should you water cocoon plant after repotting?

No — not straight away. Repot cocoon plant 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 cocoon plant after repotting?

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