Repotting guide

When & how to repot Mexican Butterwort (Pinguicula moranensis)

Also called Mexican Butterwort, Butterwort, Ping, Pinguicula.

More about mexican butterwort

About Mexican Butterwort

Pinguicula moranensis · also called Mexican Butterwort, Butterwort · houseplant

Mexican butterwort is a carnivorous rosette plant whose sticky, gland-covered leaves trap fungus gnats and small flies. Give it bright light, a mineral (peat-and-sand) mix, and distilled or rainwater only — never tap. It is not on the ASPCA list either way, so treat it as mildly toxic and confirm with a vet.

Mature size: Summer carnivorous rosette typically 5-20 cm (2-8 in) across depending on clone; compact winter succulent rosette only about 2-5 cm (1-2 in) wide. Flower stalks rise several centimetres above the foliage.

Watch for — Tap-water mineral burn: The most common killer. Dissolved salts from tap or filtered water build up in the lean mix and scorch the roots and leaves. Water only with distilled water, rainwater, or RO.

How to tell mexican butterwort needs repotting

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

Every 2–3 years, into bone-dry mix. Mexican Butterwort's growth habit — low, flat carnivorous rosette of soft, sticky, gland-covered leaves that lie close to the soil. it is heterophyllous: large carnivorous "summer" leaves in the warm growing season give way to a tight, glandless succulent "winter" rosette during its dry dormancy. sends up tall, single pink-purple flowers on slender stalks. — sets the pace. Mexican butterwort is a carnivorous rosette plant whose sticky, gland-covered leaves trap fungus gnats and small flies. Give it bright light, a mineral (peat-and-sand) mix, and distilled or rainwater only — never tap. It is not on the ASPCA list either way, so treat it as mildly toxic and confirm with a vet.

What size pot to step mexican butterwort up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Mexican Butterwort 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 mexican butterwort

Spring or summer, while mexican butterwort 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 mexican butterwort

Repot dry. Do not water mexican butterwort 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 low-nutrient mineral carnivorous 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 mexican butterwort 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 mexican butterwort 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 mexican butterwort

Mexican Butterwort wants low-nutrient mineral carnivorous mix. Never use regular potting soil or anything with added fertiliser. Use an open, lean mix such as equal parts peat, coarse sand, and perlite (or sand/perlite/vermiculite/pumice). Many growers add a little dolomitic lime or gypsum, since unlike most carnivores P. moranensis tolerates slightly mineral, near-neutral substrates. A surface layer of silica sand helps deter fungus gnats. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting mexican butterwort — frequently asked questions

How often should you repot mexican butterwort?

Every 2–3 years, into bone-dry mix for mexican butterwort. Repot mexican butterwort every 2–3 years into a snug pot of low-nutrient mineral carnivorous 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 mexican butterwort need?

When is the best time of year to repot mexican butterwort?

Should you water mexican butterwort after repotting?

No — not straight away. Repot mexican butterwort 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 mexican butterwort after repotting?

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