Repotting guide

When & how to repot Purging Jatropha (Jatropha cathartica)

Also called Purging Jatropha, Berlandier's Nettlespurge.

More about purging jatropha

About Purging Jatropha

Jatropha cathartica · also called Purging Jatropha, Berlandier's Nettlespurge · tropical

Purging Jatropha is a compact, caudiciform succulent from the Chihuahuan Desert of Mexico and southern Texas. It produces a woody, globe-shaped underground caudex from which slender stems carry deeply lobed, blue-green leaves. Small coral-red flowers appear in summer. Highly drought-adapted and suited to container culture by experienced succulent growers.

Mature size: Caudex to 20 cm wide; above-ground stems 15–35 cm tall when in active growth

How to tell purging jatropha needs repotting

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

Every 2–3 years, into bone-dry mix. Purging Jatropha's growth habit — deciduous, geophytic caudiciform with a large globe-shaped underground caudex (to 20 cm wide, 30 cm tall). during the growing season, erect stems to 35 cm tall emerge bearing 5–7-lobed, blue-green leaves. clusters of small coral-red flowers appear on slender stalks. goes fully dormant and leafless in winter or during drought. — sets the pace. Purging Jatropha is a compact, caudiciform succulent from the Chihuahuan Desert of Mexico and southern Texas. It produces a woody, globe-shaped underground caudex from which slender stems carry deeply lobed, blue-green leaves. Small coral-red flowers appear in summer. Highly drought-adapted and suited to container culture by experienced succulent growers.

What size pot to step purging jatropha up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Purging Jatropha 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 purging jatropha

Spring or summer, while purging jatropha 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 purging jatropha

Repot dry. Do not water purging jatropha 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 highly gritty, fast-draining succulent or cactus 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 purging jatropha 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 purging jatropha 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 purging jatropha

Purging Jatropha wants highly gritty, fast-draining succulent or cactus mix. A blend of 50% inorganic material (coarse perlite, pumice, or coarse grit) with 50% succulent potting mix is ideal. The caudex is highly susceptible to rot in moisture-retaining or clay-based soils. Tolerates slightly alkaline pH (7.0–8.0). Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting purging jatropha — frequently asked questions

How often should you repot purging jatropha?

Every 2–3 years, into bone-dry mix for purging jatropha. Repot purging jatropha every 2–3 years into a snug pot of highly gritty, fast-draining succulent or cactus 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 purging jatropha need?

When is the best time of year to repot purging jatropha?

Should you water purging jatropha after repotting?

No — not straight away. Repot purging jatropha 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 purging jatropha after repotting?

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