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Cup and Saucer Vine (Cobaea scandens) Seeds
New product
[Cobaea scandens] Cup and Saucer Vine seeds, a fast-growing Mexican climber with large bell-shaped flowers that shift from creamy green to deep purple.
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More info
- Cup and Saucer Vine
- The Cup and Saucer Vine Plant
- How to Sow Cup and Saucer Vine
- How to Grow Cup and Saucer Vine
- Growing Tips for Cup and Saucer Vine
- Diseases and Pests of Cup and Saucer Vine
- Uses and Curiosities of Cup and Saucer Vine
Cup and Saucer Vine
The Cup and Saucer Vine (Cobaea scandens), also known simply as Cobaea, is a climbing plant belonging to the Polemoniaceae family, native to the tropical and subtropical regions of Mexico and Costa Rica. Introduced to Europe in 1789 at the Madrid Botanical Garden, it quickly spread across the continent.
Perennial in warm climates, it is generally grown as an annual in our regions due to its sensitivity to frost: a choice that does nothing to limit its display, thanks to growth so rapid it can cover an entire trellis in a single season.
The Cup and Saucer Vine Plant
Cobaea stands out for its exceptional vigour: its slender vines can reach 3-8 metres in length in a single growing season, climbing thanks to small branched tendrils that sprout from the tips of the pinnate leaves and grip almost any support with ease, even rough surfaces.
The flowers, truly this plant's distinguishing feature, have a characteristic bell or cup shape, up to 6-7 cm wide, held by a green saucer-shaped calyx: hence its curious common name. They open initially in a creamy green colour, gradually shifting to pink and finally deep purple as they mature, a colour change that signals to pollinating insects the best moment to visit.
How to Sow Cup and Saucer Vine
Sow in protected trays from mid-February to March, at an ideal temperature of 18-24 degrees. To encourage faster, more even germination, it is advisable to soak the seeds in warm water for about two hours before sowing, then cover them with a thin layer of soil.
Germination usually takes three to four weeks: keeping the soil consistently moist, perhaps by enclosing the tray in a clear plastic bag, helps speed up the process. Transplant outdoors in mid to late May, once all risk of frost has passed.
How to Grow Cup and Saucer Vine
It prefers rich, cool but well-drained soil, enriched with a complex fertiliser at planting time. It loves full sun, provided the base of the plant is not directly exposed, and tolerates humid summer heat well while appreciating some afternoon shade in hotter climates.
It is essential to provide a sturdy support from the start: once the plant reaches 20-30 cm in height, guide it towards a trellis, pergola or wire mesh, to which it will attach itself using its tendrils. Pinching the tips of the youngest shoots also encourages branching and therefore more abundant flowering.
Growing Tips for Cup and Saucer Vine
Thanks to its very rapid growth, Cobaea is ideal for quickly covering walls, fences, pergolas and trellises, or for creating a fast, lush, flowering green screen on terraces and balconies, grown in large pots at least 30 cm in diameter.
Flowering, which continues from July until the first autumn frosts, is followed by the formation of an oval fruit containing the seeds: anyone wishing to save seed for the following season can leave a few flowers uncut to complete their natural cycle.
Diseases and Pests of Cup and Saucer Vine
Cup and Saucer Vine is generally a hardy, vigorous plant, not very prone to serious diseases when grown in well-drained soil with adequate exposure. The main risk remains waterlogging, which can encourage root rot.
Occasional pests may include aphids on the tenderest shoots, easily controlled with natural potassium soap treatments or a simple targeted jet of water.
Uses and Curiosities of Cup and Saucer Vine
Cobaea's flowers are lightly scented, especially in the evening while still young: a detail that adds even more charm to a plant already so visually spectacular, making it perfect for garden corners to be enjoyed at dusk.
Beyond its ornamental use in the garden, Cobaea is also grown on a semi-professional scale for cut flowers, much appreciated in floral arrangements for their unusual shape and the play of colours they offer from bud to full bloom.