Heron's Head Nursery Romneya Coulteri

While often grown in the ground, it can thrive in a large container if you ensure excellent drainage. Because this plant develops a significant root system, choose a deep, spacious pot to accommodate its growth habit.

It requires full sun to perform at its best. Aim for at least six to eight hours of direct sunlight daily to encourage those signature summer blooms.

Once established, this plant is quite drought-tolerant. You should water it deeply when the soil feels dry to the touch, but be careful not to let it sit in soggy soil, as this can lead to root issues.

Romneya coulteri is hardy in USDA Zone 8. If you live in a region with colder winters, you may need to provide winter protection or treat it as an annual, as it prefers milder climates.

Yes, drainage is the most critical factor. If you have heavy clay soil, amend it with grit or organic matter to ensure water flows freely away from the roots, preventing rot.

It has a bushy, vigorous growth habit. Expect it to fill out significantly during the summer, creating a substantial, full appearance that works well as a focal point in your garden.