How to Grow Platystemon Plants

Gardener's HQ Guide to Growing Creamcups

There is only one member of the hardy annual Platystemon plant genus. This is commonly referred to as Creamcups and goes by the latin name of Platystemon californicus.

The plant has green lanced shaped leaves and blooms in the summer. When it carries yellow circular flowers.

Platystemon reaches a height of about 30 cm (12 inches) when in bloom, and makes an ideal edging or border plant.

It is a relative of the Poppy family

Platystemon californicus

Cream cups
Platystemon californicus / Cream cups. Both Photographs by Tom Hilton; creative commons.

Platystemon Plant Growing and Care Guide

Common Names: Creamcups.
Family: Papaveraceae.
Life Cycle: Half hardy annual, hardy annual.
Height: 8 inches (20 cm).
Native: North America.
Growing Region: Zones 5 to 8.

Flowers: Summer.
Flower Details: Yellow, gold, white, cream. Fragrant. Single flowers. Cup-shaped. Six petals. Tufted stamens.
Foliage: Opposite. Oblong. Lanceolate.

Sow Outside: Cover seed. Before the last frost or in autumn. Spacing 6 inches (15 cm). Germination time: two to four weeks. Temperature 60°F (16°C).
Sow Inside: No.
Requirements: Full sunlight. Loam. Can survive in dry soils. Regular watering. In the spring supply a top dressing of cow manure.

How to Grow Creamcups, Platystemon Plants

The seeds of creamcups should be sown outdoors either before the last frost of spring or towards the end of autumn.

Once sown. the seeds should be covered with soil.

Alternatively buy Platystemon plants from a garden center, and put out in mid spring. Creamcups like to grow in sunny parts of the garden.

They favor a soil that has a sandy and loamy nature. Ideally the plants should be spaced at about 15 to 20 cm (6 to 8 inches) apart.

Caring for Creamcups and other Platystemon

Creamcups (Platystemon Plants) are easy to look after. They can tolerate dry conditions, but appreciate frequent watering.

If you require more Creamcups in the garden then let the plant set seed and grow in situ.

I hope that you enjoyed this guide on how to grow Platystemon plants. You may also enjoy the following Gardener's HQ growing guides: How to grow Plume Poppy, Allium aflatunense, Lathyrus plant, and Blue poppy plants.