Horned-poppy

Horned-poppy Glaucium Flavum

What is the plant

G. flavum is an erect, rosette-forming, hairy, short-lived perennial, often grown as a biennial, with pinnate, deeply-divided, rought, blue- to grey-green leaves and branched stems bearing golden yellow or orange flowers in summer.

It's considered invasive in Massachusetts.

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Lighting

Full Sun

Hardiness zone

min 5b

Difficulty

Easy

Invasive

Weed

Water
Water copiously just after planting.
Sunlight
It cannot grow in the shade
Soil
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: acid, neutral and basic (alkaline) soils.

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Pruning
How to prune: Dead leaves and bloom stems
Temperature
A very ornamental but short-lived perennial, it is hardy to about -10°c
Additional
Roots are toxic if ingested. Prolonged contact may cause skin irritation. If using as an external herbal application, use with caution and only on unbroken skin.