Repotting guide

When & how to repot Wavy Nerine (Nerine undulata)

Also called Wavy-petalled Nerine, Pink Nerine, Small Guernsey Lily.

More about wavy nerine

About Wavy Nerine

Nerine undulata · also called Wavy-petalled Nerine, Pink Nerine · flowering

Nerine undulata is a graceful South African bulb producing delicate, wavy-petalled pink flowers on slender stems in autumn. Smaller and more delicate in appearance than N. bowdenii but with a similar autumn blooming season. Suitable for pots or a sheltered garden position in mild UK areas. Toxic to pets due to lycorine alkaloids in the bulb.

Mature size: 30–45 cm tall in flower

How to tell wavy nerine needs repotting

Repotting on a calendar is less reliable than reading the plant. For wavy nerine, 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 wavy nerine

Every 2–3 years, into bone-dry mix. Wavy Nerine's growth habit — deciduous bulbous perennial with summer dormancy — sets the pace. Nerine undulata is a graceful South African bulb producing delicate, wavy-petalled pink flowers on slender stems in autumn. Smaller and more delicate in appearance than N. bowdenii but with a similar autumn blooming season. Suitable for pots or a sheltered garden position in mild UK areas. Toxic to pets due to lycorine alkaloids in the bulb.

What size pot to step wavy nerine up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Wavy Nerine 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 wavy nerine

Spring or summer, while wavy nerine 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 wavy nerine

Repot dry. Do not water wavy nerine 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 free-draining, gritty loam-based compost or sandy garden soil 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 wavy nerine 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 wavy nerine 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 wavy nerine

Wavy Nerine wants free-draining, gritty loam-based compost or sandy garden soil. Excellent drainage is essential. In pots, use John Innes No. 2 mixed with 30–40% horticultural grit. In borders, incorporate grit and sharp sand into the planting hole. Plant with the bulb nose at or just above soil level. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting wavy nerine — frequently asked questions

How often should you repot wavy nerine?

Every 2–3 years, into bone-dry mix for wavy nerine. Repot wavy nerine every 2–3 years into a snug pot of free-draining, gritty loam-based compost or sandy garden soil, 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 wavy nerine need?

When is the best time of year to repot wavy nerine?

Should you water wavy nerine after repotting?

No — not straight away. Repot wavy nerine 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 wavy nerine after repotting?

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