Romneya Coulteri Seeds

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Romneya coulteri is a beautiful plant commonly known as the Californian Tree Poppy. Technically a deciduous herbaceous perennial, it will die down in winter, it is shrub like in summer when masses of huge poppy fired egg flowers appear – the largest flowers in the poppy family.  Slow to get growing, it can be vigorous and suckering when established so give plenty of room!

The plant was first described in 1833 by Dr Thomas Coulter of Newry (1793-1843), a botanist who collected in California and Mexico. The species name coulteri is in honour of Dr Coulter. The name Romneya commemorates the celebrated Irish astronomer Dr Thomas Romney Robinson (1792-1882). The two men were, in fact, friends. It was not introduced to cultivation until 1875 and it first flowered, appropriately enough, in the Botanic Gardens at Glasnevin, in Dublin, in 1876.

Pretty Wild Seeds are registered with the Department for Environment, Food & Rural Affairs (DEFRA) under number 7529, so you can have confidence in both our products and advice. Although our products are listed in weights and acres, we can supply in additional quantities upon enquiry so if you need a larger supply, please don't hesitate to give us a call.

  • 10 seeds for £2.35
  • 50 seeds for £4.99
  • Quantities from: £2.35

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    The Romneya Coulteri Seeds is shown in Rare & Exotic Seeds.

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    We happily accept returns within 14 days from date of delivery. All returns must be received in the same condition and packaging we sent them. Postage charges will not be refunded on unwanted products.

    You are solely responsible for ensuring the goods are returned to us. We will not be liable for returns that are lost in the post or lost for any other reason. If a product arrives damaged we will advise the customer how to return the item with all return costs covered by us.  Replacements & refunds will be dispatched / issued on receipt of the returned items only.

    Germination; Sow under glass in autumn-winter. Sow indoors at any time. Indoors, surface sow onto a moist but well-drained sowing mix with added sand or perlite for drainage. Do not cover seed, simply press into the soil. Light is needed for germination. Cold stratify, ideal temp. 2-5°C for 2-3 months, a fridge is ideal. Remove to warmth 10-15°C for germination. In a greenhouse allow natural winter cold, followed by spring warmth to offer ideal temp. conditions. Germination can be difficult and irregular often taking several months. It is said germination can be improved by smoking the seeds with a pine-based smoke. As soon as radicles appear transplant carefully to final position. This plant resents transplanting and many plants can be lost at this stage.

    Growing; Prefers a fertile, well-drained soil in full sun. Offer a sheltered location away from cold, drying winds. Can be slow to establish taking several years to bloom from seed. Offer a deep, dry winter mulch for protection.

    Cultivation; This plant will die down in winter. Pruning Group 6. Cut back to near-ground level in mid-spring as this stimulates strong, new growth. Avoid pruning in winter to prevent frost damage on new shoots. Propagate by seed or basal cuttings taken in spring.