Treacle mustard
Erysimum cheiranthoides
Treacle mustard is a hardy, fast-growing wildflower that thrives in well-drained soils under full sun to partial shade and requires minimal watering once established. It self-seeds readily, making it a reliable addition to cottage gardens, meadow plantings, or pollinator borders. Deadhead spent flowers if you wish to control spreading, but otherwise this plant needs very little attention.
Toxicity Warning
Known to be toxic to horses.
Care Level
Low
Sun
Partial Sun
Water
Moderate
Growth Rate
Moderate
Mature Height
12″ – 48″
Soil
sandy loam
Life Cycle
Perennial
Spacing
10″
Watering Schedule
Every 7-10 Days • Water Moderately Until Soil Is Evenly Moist; Allow The Top Inch To Dry Between Waterings
Soil pH
7 – 7.5
Temperature
-20° – 90°F
Mature Spread
up to 18″
Root Depth
Medium
Foliage
Fine
Native to
Attracts
Sources
Data: trefle, usda, aspca
Image: trefle.io — Taken Jun 29, 2012 by Andrzej Konstantynowicz (cc-by-sa)
No nurseries currently have this species in stock.