Solandra maxima

Growing in Pots, Balconies & Indoors

Cup of gold vine (Solandra maxima) is a massive tropical climber reaching 7-15 m (20-45 ft), so a container only suits it while young or where you can keep it hard-pruned as a patio specimen – long term it wants far more room than a pot gives. It is not a houseplant, but being frost-tender it is often potted so it can be sheltered in cold climates.

Quick Details

• Container Size: A large 40 L+ (10 gal+) pot with a stout trellis and strong drainage (general guidance – it will outgrow any pot in time)
• Indoor Suitability: Not a houseplant and far too large; a pot is only for young plants or for overwintering under glass
• Best Spot: Full sun to part shade, with sturdy support
• Soil & Drainage: Rich, well-aerated mix that drains freely
• Watering in Pots: Water generously in growth as pots dry fast; ease back in cool weather

Indoors & On the Windowsill

• Houseplant limits: Not an indoor plant – it is a vigorous, heavy climber that needs full sun and space.
• Overwintering: The reason to pot it is portability: in cold regions move the pot into a bright, frost-free conservatory or greenhouse over winter.
• Safety: All parts are highly poisonous (tropane alkaloids, as in its nightshade relatives) – keep it well away from children and pets and wash hands after pruning.

On a Balcony or Patio

• Light & wind: Give it full sun and a very strong support fixed to a wall or railing; the heavy vine catches wind badly, so anchor it well. Reflected wall heat suits it but dries the pot fast – water often.
• Practicalities: A big vine in a large pot is heavy and unwieldy – site it permanently and secure the trellis.

Choosing the Pot, Soil & Long-Term Care

• Pot & drainage: A large 40 L+ pot with strong drainage holes and a sturdy trellis. Skip a standing-water saucer, which keeps the roots wet and invites rot. Terracotta breathes and dries faster; glazed or plastic pots hold moisture longer.
• Potting mix: Well-aerated and organic-rich – a quality potting mix, or peat/coir with perlite or vermiculite for drainage.
• Feeding: Potted plants need feeding more often than those in the ground, since frequent watering leaches nutrients away – feed through the growing season with a balanced, organic-rich fertilizer.
• Repotting: Every couple of years refresh the mix and pot on a size; for perennials, lightly prune the root ball and top growth at the same time to keep them vigorous.

Bloom & Flower Guide

Quick Details

• Bloom Season: Mostly year-round, with the heaviest flush in autumn and winter
• Flower Appearance: Very large, fragrant, chalice-shaped flowers, golden-yellow to orange with a purple-brown stripe down the center of each of the five petals, 10-20 cm or more across
• Edibility: Not edible – the whole plant is toxic. Grown purely as an ornamental

Detailed Blooming Overview

The cup of gold vine is grown entirely for its spectacular flowers: huge, goblet-shaped golden chalices, sweetly fragrant in the evening, that unfurl over a long season and peak through the cooler months. The blooms are magnificent but the plant is poisonous throughout, so it is one to admire rather than handle carelessly.

Flower Characteristics

• Enormous cup- or chalice-shaped flowers with five broad petals.
• Golden-yellow ageing to orange, each petal marked with a deep purple-brown stripe down the middle.
• Richly fragrant, especially at night, and 10-20 cm or more across.

Bloom Care & Thinning

• Encouraging bloom: Full sun, a sturdy support and restrained feeding bring the best flowering; over-rich soil pushes leafy growth at the expense of flowers.
• Pruning for bloom: Light pruning after a flush keeps the vine within bounds and encourages fresh flowering wood.
• Safety: Wear gloves when pruning and keep all parts away from children and pets – the whole plant is poisonous.