In this Gardener's HQ guide, we'll explore cultivating Cobaea plants in your garden, indoor spaces, and other settings.
Members of the Cobaea plant genus are climbing vines. They can reach four metres (13 feet) in size.
Although they are half hardy perennials in nature, gardeners often treat the Cobaea plant as half hardy annuals.
They have bell shaped flowers of white, yellow, or purple. Cobaea is know by the more common names of Cathedral bells, Mexican Ivy, and Cup and Saucer vine.
They bloom from summer to Autumn.
Cobaea scandens cup and saucer vine by Zixii.
Cobaea scandens (Cup-and-saucer Vine / Cathedral Bells / Mexican Ivy / Monastery Bells), photograph by Forest and Kim Starr; CC.
Cobaea pringlei (Pringle's Cathedral Bells), picture by peganum; CC.
If planning to grow Cobaea plants from seeds indoors, then the seeds should be nicked with a knife. Sow in peat pots, then lightly cover with topsoil.
Cathedral bells, take around two to four weeks to germinate. This should be done at about 22 to 24 degrees centigrade (72 to 75°F).
Cobaea should be started about two months before the seedlings are due to be transplanted in the middle of spring,after the last possible frost.
Seedlings should be spaced at about one meter (40 inches). Locate in a sunny part of the garden.
Once growing, the young tips of Cobaea should be pinched to create branching.
Cobaea should be watered regularly, and supported on a trellis.
The Cobaea genus is relatively small, comprising only about 20 species, each with its unique traits.
Yes, members of the Cobaea genus, such as Cobaea scandens (Cup-and-Saucer Vine), are stunning climbers perfect for covering walls, fences, or trellises.
The most commonly grown species is Cobaea scandens (Cup-and-Saucer Vine), popular for its fast growth, large bell-shaped flowers, and attractive foliage.
Yes, some species like Cobaea scandens have mildly fragrant flowers, especially noticeable in the evenings.
Cobaea requires full sun to part shade, fertile, well-drained soil, and a strong support structure for optimal growth.
Presently, Cobaea is not listed as invasive in the USA, but as with any plant, care should be taken to control its spread in suitable conditions.
To remove Cobaea, cut back the vines and remove the roots manually. Persistent growth may need treatment with a suitable herbicide.
The Cobaea genus, part of the Polemoniaceae family, is native to Mexico. The most popular species, Cobaea scandens or the cup-and-saucer vine, is a fast-growing, climbing plant known for its large, bell-shaped flowers that bloom from summer to autumn.
Cobaea should be planted in a sunny location with fertile, well-drained soil. They can be grown from seeds sown in spring. Regular watering and feeding are necessary for optimal growth. Given their climbing habit, they need support to climb, making them an ideal choice for trellises or pergolas.
I hope that you enjoyed this guide on how to grow Cobaea plants. You may also enjoy the following Gardener's HQ Polemoniaceae growing guides: How to grow Annual Phlox, Soldanella, Brachyscome, and Gilia plants.