Californian Poppy Tree Romneya coulteri Californian Poppy Tree Romneya coulteri
Californian Poppy Tree Romneya coulteri
Californian Poppy Tree Romneya coulteri

Californian Poppy Tree 'Romneya coulteri'

Amaze your neighbours and grow what can only be described as the biggest poppies around!
Plant In Sunshine
Winter Hardy
RHS Garden Merit
  • Rare and unusual, the Californian Tree Poppy produces crepe-paper white poppies with yellow centres.
  • Some of the largest flowers in the poppy family – blooms up to 15cm (6in) in width.
  • With its divided, grey-green leaves, it's an excellent specimen plant for a sunny mixed border.
  • Awarded the RHS Award of Garden Merit and you can be sure that this is a proven garden performer.
  • Supplied as 3 x established plants in 9cm pots, ready to plant out, growing to a height of 2.5m (8.2ft).
3 x 9cm Pot - Item: 511333
RRP £29.97
Deal Price £24.97
Save: £5.00 - 16%
Currently Unavailable

Product Description

Rare and unusual, Romneya coulteri (also known as the Californian Tree Poppy) produces voluminous, crepe-paper white poppies with golden-yellow centres. Widley admired for its blooms, it begins flowering in early July and goes on until the autumn producing some of the largest flowers in the poppy family – up to 15cm (6in) in width.

With its divided, grey-green leaves this native of dry coastal Californian scrubland is hardy and will die down in winter, and although slow to get established, it’s vigorous once it’s happy.

An excellent specimen plant for a sunny mixed border, Romneya is fully deserving its coveted RHS Award of Garden Merit, you can be sure that this is a proven garden performer, guaranteed to be suitable for UK gardeners at every level of experience. You can therefore plant this in the garden with confidence, for stunning displays for many years to come.

Supplied as 3 x established plants in 9cm pots, ready to plant out, growing to a height of 2.5m (8.2ft).

What Is Supplied

Item 511333 supplied as:

Supplied as 3 x established plants in 9cm pots, ready to plant out, growing to a height of 2.5m (8.2ft).

Plant Information

Top Tips

Californian Tree Poppies dislike transplanting but once established can spread, so choose your planting position carefully

Care Guide

Planting Advice for your Romneya coulteri (Californian Tree Poppy):

  • Best in full sun in fertile, well-drained soil against a warm, sunny wall protected from cold winds.
  • Dig a planting hole 3 x wider than the roots of the shrub you're planting and mix some well-rotted compost or manure with the soil from the hole and use this to re-fill once the shrub is in place.
  • We've found that a square hole is better than a round one as the new roots, once they reach the edges tend to grow in a circle round the circumference of the hole whereas when they reach the corners of a square hole, they find it easier to grow through.
  • Before planting soak container-grown shrubs thoroughly and allow to drain.
  • Remove the plant from its pot and tease out a few of the roots.
  • Add Mycorrhizal fungi to the roots when planting to help plants establish quicker.
  • Place your shrub in the hole at the same level at the pot then refill the hole with the earth removed (backfilling).
  • Firm in the soil with your heel, avoiding the root ball and water well.
  • Mulch around the base of the plant with a collar, compost, gravel, bark etc.

Aftercare advice for Californian Tree Poppy:

  • Keep plants well-watered while they establish.
  • Use plant supports later in the flowering season.
  • Provide a deep, dry mulch in the winter months for protection. 
  • Cut back flower stems close to the base in March.
Planting / Flowering Calendar
Planting Time
Flowering Time
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Fully Grown Plant dimensions (approx)
Plant Dimensions
250cm
150cm
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Californian Poppy Tree 'Romneya coulteri'
Californian Poppy Tree 'Romneya coulteri'
3 x 9cm Pot
Item: 511333
RRP £29.97
Deal Price £24.97
Save: £5.00 - 16%
Currently Unavailable