Repotting guide

When & how to repot Tian Shan Everlasting (Helichrysum thianschanicum)

Also called Tian Shan Everlasting, Silver Spike, Liquorice Plant.

More about tian shan everlasting

About Tian Shan Everlasting

Helichrysum thianschanicum · also called Tian Shan Everlasting, Silver Spike · flowering

Helichrysum thianschanicum is a woolly, mound-forming semi-evergreen subshrub native to the dry, gravelly steppe and mountain slopes of the Tian Shan range on the Kazakhstan–Xinjiang border. It is grown primarily for its striking silver-white foliage and produces small yellow flowerheads on upright stems in summer. The single most critical care requirement is excellent drainage — it evolved in extremely lean, dry soils and will rot quickly in moisture-retentive ground. Helichrysum is not formally listed by the ASPCA; treat as mildly-toxic as a precaution.

Mature size: 30–45 cm tall and 45–60 cm wide.

How to tell tian shan everlasting needs repotting

Repotting on a calendar is less reliable than reading the plant. For tian shan everlasting, 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 tian shan everlasting

Every 2–3 years, into bone-dry mix. Tian Shan Everlasting's growth habit — dense, woolly, mound-forming semi-evergreen subshrub with intensely silver-white stems and leaves. — sets the pace. Helichrysum thianschanicum is a woolly, mound-forming semi-evergreen subshrub native to the dry, gravelly steppe and mountain slopes of the Tian Shan range on the Kazakhstan–Xinjiang border. It is grown primarily for its striking silver-white foliage and produces small yellow flowerheads on upright stems in summer. The single most critical care requirement is excellent drainage — it evolved in extremely lean, dry soils and will rot quickly in moisture-retentive ground. Helichrysum is not formally listed by the ASPCA; treat as mildly-toxic as a precaution.

What size pot to step tian shan everlasting up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Tian Shan Everlasting 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 tian shan everlasting

Spring or summer, while tian shan everlasting 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 tian shan everlasting

Repot dry. Do not water tian shan everlasting 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 lean, sharply drained, sandy or gritty 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 tian shan everlasting 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 tian shan everlasting 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 tian shan everlasting

Tian Shan Everlasting wants very lean, sharply drained, sandy or gritty. Rich or moisture-retentive soil leads to stem rot. Add pea gravel or coarse grit generously when planting in heavier ground. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting tian shan everlasting — frequently asked questions

How often should you repot tian shan everlasting?

Every 2–3 years, into bone-dry mix for tian shan everlasting. Repot tian shan everlasting every 2–3 years into a snug pot of very lean, sharply drained, sandy or gritty, 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 tian shan everlasting need?

When is the best time of year to repot tian shan everlasting?

Should you water tian shan everlasting after repotting?

No — not straight away. Repot tian shan everlasting 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 tian shan everlasting after repotting?

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