Repotting guide

When & how to repot Solanum crispum 'Glasnevin' (Solanum crispum 'Glasnevin')

Also called Glasnevin Chilean potato tree, Chilean potato vine.

More about solanum crispum 'glasnevin'

About Solanum crispum 'Glasnevin'

Solanum crispum 'Glasnevin' · also called Glasnevin Chilean potato tree, Chilean potato vine · flowering

Solanum crispum 'Glasnevin' is a vigorous, semi-evergreen scrambling climber prized for clusters of star-shaped, purple-blue flowers with bright yellow centres borne from summer into autumn. It is one of the hardiest Solanums, needing a warm, sheltered wall, full sun, and tying-in to support as it does not self-cling. All parts are toxic if eaten.

Mature size: Around 4-6 m tall and 2-3 m wide against a wall over several years.

Watch for — Sparse flowering: Usually too little sun or excess nitrogen. Site in full sun and switch to a high-potash feed; over-feeding with nitrogen drives foliage at the expense of blooms.

How to tell solanum crispum 'glasnevin' needs repotting

Repotting on a calendar is less reliable than reading the plant. For solanum crispum 'glasnevin', watch for these signs:

Roots spiralling thickly out of the drainage holes or pushing the whole plant up out of the pot.
The pot is so packed that water runs straight through in seconds and barely wets the soil.
It has split a plastic pot, or the rootball is a solid mass with almost no soil left when you slide it out.
Growth and (for solanum crispum 'glasnevin') flowering have clearly stalled despite good light and feeding — but remember this plant likes being snug, so a little crowding alone is not a reason to repot.

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 solanum crispum 'glasnevin'

Only every 2–4 years, when genuinely crowded. Solanum crispum 'Glasnevin' is one of the plants that genuinely prefers a snug pot — it grows and flowers better with its roots a little restricted, so resist the urge to repot it on schedule. Vigorous semi-evergreen scrambling climber; lax, twining stems that must be tied in to wires or trellis as it does not cling unaided..

What size pot to step solanum crispum 'glasnevin' up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Solanum crispum 'Glasnevin' positively prefers a snug pot: it flowers and grows better when the roots are a little restricted. The single biggest repotting mistake here is over-potting — dropping solanum crispum 'glasnevin' into a pot two or three sizes up. All that surplus soil holds water the small root system cannot use, stays cold and wet, and rots the roots within weeks. When in doubt, choose the smaller pot.

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 solanum crispum 'glasnevin'

Early spring, just as new growth restarts, is the ideal window for solanum crispum 'glasnevin'. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting solanum crispum 'glasnevin'

Confirm it actually needs it. Slide solanum crispum 'glasnevin' out and check the roots. Only continue if it is genuinely packed — this plant prefers a snug pot, so if there is still soil and room, put it straight back.
Pick a pot only one size up. Choose a pot just 2–3 cm wider with good drainage. Resist anything bigger; over-potting is the main killer here.
Ease it out gently. Water lightly the day before, then tip solanum crispum 'glasnevin' out, supporting the base. Tease the outer roots free only enough to stop them circling.
Repot at the same depth. Add a layer of fresh fertile, moist but free-draining loam, set the plant so the soil line sits exactly where it did before, and backfill around the sides, firming lightly.
Settle it in. Water once to settle the soil, then let it sit. Hold off on more water until the top of the soil dries — fresh soil around a small root system stays wet for a while.

Aftercare

Because the new soil holds more water than the old crammed rootball did, ease right back on watering — let the top of the soil dry before you water solanum crispum 'glasnevin' again, or you will rot the roots in the very pot you just moved it to. Keep it out of harsh direct sun for a fortnight. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for solanum crispum 'glasnevin'

Solanum crispum 'Glasnevin' wants fertile, moist but free-draining loam. Thrives in moderately fertile, well-drained soil of any pH including chalk. Improve heavy clay with grit and organic matter; mulch the root zone to keep it cool and moist. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting solanum crispum 'glasnevin' — frequently asked questions

How often should you repot solanum crispum 'glasnevin'?

Only every 2–4 years, when genuinely crowded for solanum crispum 'glasnevin'. Only repot solanum crispum 'glasnevin' every 2–4 years, and only when it is genuinely root-bound — it flowers and grows best slightly crowded. Step up just one pot size in spring using fertile, moist but free-draining loam. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does solanum crispum 'glasnevin' need?

When is the best time of year to repot solanum crispum 'glasnevin'?

Does solanum crispum 'glasnevin' like to be root-bound?

Yes — solanum crispum 'glasnevin' genuinely flowers and grows best when slightly pot-bound, so do not rush to repot it. The mistake to avoid is over-potting into a much larger pot: the excess soil stays wet, the roots cannot use it, and the plant rots. Only repot every few years and only one snug size up.

Should you fertilise solanum crispum 'glasnevin' after repotting?

Not immediately. Wait about 4 weeks after repotting solanum crispum 'glasnevin'. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.