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botanical name:
Erysimum dubium
Erysimum dubium © Deeproot Plant Base
common name:  Perennial wallflower
family:  Brassicaceae
characteristics: perennial, evergreen, ground-cover
height: 0.20m
width: 0.35m
growth rate: medium
growth habit: mounding
leaf colour: dark green
flower colour: yellow
main season: Spring
poison symbol poisonous or irritant
aspect: full sun
conditions: dry soil, sandy soil
preferred soil pH: alkaline
minimum temp: -29°C
USDA zone: 5 to 9
description:
Evergreen mat forming perennial with small narrow, dark green leaves. Clusters of bright yellow flowers in spring.

cultivation:
Sharply drained, preferably poor, alkaline, soil in full sun. Fully Hardy rock garden plant.

other notes:
From the European Alps.
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