Repotting guide

When & how to repot Comb Cycad (Cycas pectinata)

Also called Comb Cycad, Pectinate Cycad.

More about comb cycad

About Comb Cycad

Cycas pectinata · also called Comb Cycad, Pectinate Cycad · tropical

Cycas pectinata is a widespread cycad distributed from Nepal and northeast India through Southeast Asia to southern China, growing in dry deciduous forest and rocky hillside habitats at a wide range of elevations. It forms a stout trunk topped by a crown of stiff, dark-green pinnate fronds whose leaflets are held at a distinctive flat, comb-like angle — giving the species its common name. The most important care factor is full sun and fast-draining soil; this species is more drought-tolerant than many cycads once established. All parts are highly toxic to pets and humans.

Mature size: Trunk to 3 m tall in the wild; typically 1–2 m in cultivation after many decades; frond spread 2–3 m.

How to tell comb cycad needs repotting

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

Every 2–3 years, into bone-dry mix. Comb Cycad's growth habit — slow-growing, single-trunked cycad producing a dense crown of stiffly arching pinnate fronds with leaflets held in a characteristic flat, comb-like arrangement. — sets the pace. Cycas pectinata is a widespread cycad distributed from Nepal and northeast India through Southeast Asia to southern China, growing in dry deciduous forest and rocky hillside habitats at a wide range of elevations. It forms a stout trunk topped by a crown of stiff, dark-green pinnate fronds whose leaflets are held at a distinctive flat, comb-like angle — giving the species its common name. The most important care factor is full sun and fast-draining soil; this species is more drought-tolerant than many cycads once established. All parts are highly toxic to pets and humans.

What size pot to step comb cycad up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Comb Cycad 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 comb cycad

Spring or summer, while comb cycad 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 comb cycad

Repot dry. Do not water comb cycad 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 sandy, gritty, very free-draining loam 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 comb cycad 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 comb cycad 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 comb cycad

Comb Cycad wants sandy, gritty, very free-draining loam. Mix equal parts loam-based compost, coarse grit, and horticultural sand; good drainage prevents the root and crown rots that kill cycads. A slightly acidic to neutral pH of 6.0–7.0 is preferred. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting comb cycad — frequently asked questions

How often should you repot comb cycad?

Every 2–3 years, into bone-dry mix for comb cycad. Repot comb cycad every 2–3 years into a snug pot of sandy, gritty, very free-draining loam, 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 comb cycad need?

When is the best time of year to repot comb cycad?

Should you water comb cycad after repotting?

No — not straight away. Repot comb cycad 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 comb cycad after repotting?

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