Repotting guide

When & how to repot straight-leaved butterwort (Pinguicula rectifolia)

Also called straight-leaved butterwort, Mexican butterwort.

More about straight-leaved butterwort

About straight-leaved butterwort

Pinguicula rectifolia · also called straight-leaved butterwort, Mexican butterwort · houseplant

A compact Mexican butterwort from the mountains of Oaxaca, Pinguicula rectifolia traps fungus gnats and small insects on glistening sticky leaves. It cycles between a carnivorous summer rosette and a tight succulent winter rosette. Easy on a bright windowsill with mineral-free water and a gritty, low-nutrient mix.

Mature size: Rosette 5–8 cm (2–3 in) in diameter at peak summer growth

Watch for — Crown rot: Caused by water pooling in the rosette centre or poor air circulation. Water only at soil level and ensure the pot drains freely. Increase airflow around the plant.

How to tell straight-leaved butterwort needs repotting

Repotting on a calendar is less reliable than reading the plant. For straight-leaved 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 straight-leaved butterwort

Every 2–3 years, into bone-dry mix. straight-leaved butterwort's growth habit — rosette-forming perennial with a distinct summer carnivorous phase (flat, sticky leaves 6–7 cm) and a compact succulent winter phase (tight, non-sticky leaves 3–4 cm). — sets the pace. A compact Mexican butterwort from the mountains of Oaxaca, Pinguicula rectifolia traps fungus gnats and small insects on glistening sticky leaves. It cycles between a carnivorous summer rosette and a tight succulent winter rosette. Easy on a bright windowsill with mineral-free water and a gritty, low-nutrient mix.

What size pot to step straight-leaved butterwort up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. straight-leaved 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 straight-leaved butterwort

Spring or summer, while straight-leaved 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 straight-leaved butterwort

Repot dry. Do not water straight-leaved 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 mineral carnivorous plant 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 straight-leaved 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 straight-leaved 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 straight-leaved butterwort

straight-leaved butterwort wants mineral carnivorous plant mix. Use a fast-draining, nutrient-poor mineral mix: equal parts perlite, vermiculite, coarse horticultural sand, and a small amount of pumice or volcanic lava. Avoid peat-heavy mixes and never use standard potting compost or fertilised media. Shallow terracotta or plastic pots with drainage holes are suitable. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting straight-leaved butterwort — frequently asked questions

How often should you repot straight-leaved butterwort?

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

When is the best time of year to repot straight-leaved butterwort?

Should you water straight-leaved butterwort after repotting?

No — not straight away. Repot straight-leaved 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 straight-leaved butterwort after repotting?

Not immediately. Wait about 3 weeks after repotting straight-leaved 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.