Species Purple Cress
white flowers with yellow-green stamens and center, green stems and leaves

Purple Cress

Cardamine douglassii

Also Known As - Limestone Bittercress
Purple Cress (Cardamine douglassii) is a native perennial wildflower found growing in moist woods and rocky open forest areas in central to eastern regions of the United States. It has elongated stems, and asymmetrical petal-like blue-violet flowers that bloom between April and June. Its leaves are basal and trifoliate, and they turn from purple to green in the summer. Once established, Purple Cress forms colonies in shaded areas and is easy to grow. This species is a good choice for naturalizing or in natural rock gardens where it provides attractive ground cover.

Watering:

Minimal

Hardiness Zone:

Sun:

full sun,part shade

Leaf:

Yes

Growth Rate:

Low

Drought Tolerant:

Yes

Salt Tolerant:

Yes

Invasive:

Yes

Care Level:

Medium

watering

Toothed bittercress is a hardy plant that can thrive in many different conditions. It does well in moist soils, but will also tolerate dryer soil. When watering, it's generally best to err on the side of caution and provide enough water to keep the soil moist, but not soggy. During the warmer months, watering the plant every few days should be adequate. During the cooler months, it may only need to be watered once a week or every other week. It’s important to look for signs of drought stress (such as wilted or yellowed foliage) between watering, as this will help you to better gauge when to water the plant. Always remember to water thoroughly, as infrequent, light watering can promote shallow root growth.

sunlight

Toothed Bittercress needs moderate to full sunlight in order to thrive. It should be planted in a location that gets at least 6 hours of direct sunlight per day. However, you should avoid planting it in an area that receives direct sunlight all day, as this can cause the plant to become scorched due to the intense heat. They will still do well in spots that receive partial sunlight, as long as the plant gets enough direct sun to develop photosynthesize and grow healthily.

pruning

Toothed Bittercress (Cardamine dentata) is best pruned in early spring, before new growth appears. For less vigorous plants, remove any dead or damaged stems and any weak shoots that emerge from the lower parts of the plant. If more pruning is needed, selectively remove overgrown or scruffy-looking parts of the plant, taking care to retain a pleasing overall shape. For plants with multiple stems, lightly trim outward facing stems to encourage fuller growth and prevent a lopsided, top-heavy structure. Prune just above a leaf node to encourage more shoots.

⚠️ Perenual and its members cannot be held liable for any health issues that may arise from the information provided on the website or from using any of the plants found on the site. The information provided is intended to be used as general guidelines only.