Repotting guide

When & how to repot Tongue Leaf Plant (Glottiphyllum longum)

Also called Tongue Leaf Plant, Long-leaved Tongue Plant.

More about tongue leaf plant

About Tongue Leaf Plant

Glottiphyllum longum · also called Tongue Leaf Plant, Long-leaved Tongue Plant · houseplant

Glottiphyllum longum is a South African mesemb succulent forming rosettes of elongated, tongue-shaped, bright green leaves that are notably soft and fleshy. Bright yellow, daisy-like flowers appear in autumn and winter. It is one of the easier Glottiphyllum species to grow but is prone to overwatering and overfeeding, which causes excessive leaf stretching.

Mature size: 5–10 cm tall; rosettes 10–15 cm across; clumps spread to 20–30 cm wide

Watch for — Root rot: Caused by consistently moist soil or waterlogged pots. Leaves turn soft and yellowing starts at the base. Remove the plant, trim rotted roots, dust with sulphur powder, and repot into fresh dry gritty mix.

How to tell tongue leaf plant needs repotting

Repotting on a calendar is less reliable than reading the plant. For tongue leaf 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 tongue leaf plant

Every 2–3 years, into bone-dry mix. Tongue Leaf Plant's growth habit — low-growing rosette-forming succulent; produces pairs of elongated leaves and spreads slowly via lateral shoots. — sets the pace. Glottiphyllum longum is a South African mesemb succulent forming rosettes of elongated, tongue-shaped, bright green leaves that are notably soft and fleshy. Bright yellow, daisy-like flowers appear in autumn and winter. It is one of the easier Glottiphyllum species to grow but is prone to overwatering and overfeeding, which causes excessive leaf stretching.

What size pot to step tongue leaf plant up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Tongue Leaf 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 tongue leaf plant

Spring or summer, while tongue leaf 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 tongue leaf plant

Repot dry. Do not water tongue leaf 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 very gritty, low-nutrient 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 tongue leaf 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 tongue leaf 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 tongue leaf plant

Tongue Leaf Plant wants very gritty, low-nutrient succulent mix. Use a lean cactus mix combined with 50% coarse perlite or grit. Avoid nutrient-rich or peat-heavy soils, which cause the already fleshy leaves to grow overly long and soft. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting tongue leaf plant — frequently asked questions

How often should you repot tongue leaf plant?

Every 2–3 years, into bone-dry mix for tongue leaf plant. Repot tongue leaf plant every 2–3 years into a snug pot of very gritty, low-nutrient 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 tongue leaf plant need?

When is the best time of year to repot tongue leaf plant?

Should you water tongue leaf plant after repotting?

No — not straight away. Repot tongue leaf 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 tongue leaf plant after repotting?

Not immediately. Wait about 3 weeks after repotting tongue leaf 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.