Fertilising guide

How to fertilise Solanum crispum 'Glasnevin' (Solanum crispum 'Glasnevin')— schedule & NPK

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.

Growth habit: Vigorous semi-evergreen scrambling climber; lax, twining stems that must be tied in to wires or trellis as it does not cling unaided.

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.

What fertiliser solanum crispum 'glasnevin' actually wants — and why

Solanum crispum 'Glasnevin' is a heavy-blooming flower with a big appetite — a regular high-potash feed through the season is what drives a long, dense display.

A high-potassium ("high-potash") flowering feed — tomato-style or a dedicated bloom/rose feed. Potassium powers flowering; a high-nitrogen feed gives you a leafy plant with disappointing bloom.

For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for solanum crispum 'glasnevin': match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.

How often to feed solanum crispum 'glasnevin', and which months

Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For solanum crispum 'glasnevin':

Apply a balanced general fertiliser in spring and a high-potash feed (such as tomato food) through the flowering period to sustain bloom. Avoid excess nitrogen, which favours leafy growth over flowers. For a hungry bloomer that means feeding regularly — sparingly through the growing season — right through flowering across the main season (spring through early autumn), tapering as blooming ends.

The dormant-season rule matters more than the exact interval: skip feeding entirely when solanum crispum 'glasnevin' is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.

What strength to mix for solanum crispum 'glasnevin'

Follow the flowering-feed label rate for solanum crispum 'glasnevin', or half strength if feeding very frequently. These plants genuinely use the nutrients — under-feeding shows up fast as a thin display.

Feeding always goes onto already-damp soil, never dry roots — water solanum crispum 'glasnevin' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the solanum crispum 'glasnevin' watering schedule.

Signs you are over-feeding solanum crispum 'glasnevin'

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for solanum crispum 'glasnevin':

Lots of lush leaves but few flowers (too much nitrogen).
Scorched leaf edges and salt crust from too-strong or too-frequent feeds.
Soft, sappy growth prone to aphids and mildew.

Signs you are under-feeding solanum crispum 'glasnevin'

Sparse, small, short-lived flowers and pale foliage.
A tired plant that stops blooming early in the season.
Weak growth and poor repeat-flowering after the first flush.

If the symptoms point at watering, light or roots rather than nutrition, the full solanum crispum 'glasnevin' care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Container-grown solanum crispum 'glasnevin' accumulates feed salts fast with frequent feeding — water until it drains each time and flush pots with plain water every few weeks to prevent scorch.

Organic vs synthetic feeds for solanum crispum 'glasnevin'

Organic options

A liquid comfrey or seaweed feed (naturally potassium-rich) plus compost or well-rotted manure as a mulch. UK: comfrey feed, organic Tomorite, or rose feed; US: Espoma Rose-tone or Neptune's Harvest. Feeds and improves soil.

Synthetic / liquid feeds

A high-potash flowering feed on a regular cadence — UK: Tomorite (Levington), Phostrogen or a specialist rose feed; US: Miracle-Gro Bloom Booster or a rose food. Fast, reliable bloom response.

Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.

Fertilising solanum crispum 'glasnevin' — frequently asked questions

What fertiliser does solanum crispum 'glasnevin' need?

A high-potassium ("high-potash") flowering feed — tomato-style or a dedicated bloom/rose feed. Potassium powers flowering; a high-nitrogen feed gives you a leafy plant with disappointing bloom. Solanum crispum 'Glasnevin' is a heavy-blooming flower with a big appetite — a regular high-potash feed through the season is what drives a long, dense display.

How often should I feed solanum crispum 'glasnevin'?

Apply a balanced general fertiliser in spring and a high-potash feed (such as tomato food) through the flowering period to sustain bloom. Avoid excess nitrogen, which favours leafy growth over flowers. Apply a balanced general fertiliser in spring and a high-potash feed (such as tomato food) through the flowering period to sustain bloom. Avoid excess nitrogen, which favours leafy growth over flowers. For a hungry bloomer that means feeding regularly — sparingly through the growing season — right through flowering across the main season (spring through early autumn), tapering as blooming ends.

What strength of feed for solanum crispum 'glasnevin'?

What does over-feeding solanum crispum 'glasnevin' look like?

Lots of lush leaves but few flowers (too much nitrogen). Scorched leaf edges and salt crust from too-strong or too-frequent feeds. Soft, sappy growth prone to aphids and mildew. Using a high-nitrogen general feed on solanum crispum 'glasnevin' is the headline mistake — you grow a big leafy plant with few flowers. The second is simply under-feeding a genuinely hungry bloomer and getting a sparse, short display.

Should I flush the soil of solanum crispum 'glasnevin'?