Species Swamp Thistle
Magenta flower with  gray-green bulb, green sepal and stem.

Swamp Thistle

Cirsium muticum

Swamp Thistle is a native flowering plant species. Its distinctive strappy foliage is light green to grey-green in color. The plant produces large composite flower heads that are creamy white or pale yellow in color, and these produce some of the most impressive displays of flower color in its local range. The plant has a long, slender stalk, making it an ideal candidate for many different species of garden wildlife, such as birds, bees, and butterflies. It is a hardy species, capable of surviving in both wet and dry conditions, and even in human-disturbed environments, as long as its soil moisture needs are met.

Watering:

Frequent

Propagation:

Division,Root Cutting,Seed Propagation,Layering Propagation,Cutting

Hardiness Zone:

Sun:

full sun,part shade

Fruits:

brown,tan Fruits Ready In Fall

Leaf:

Yes

Leaf Color:

green

Growth Rate:

High

Drought Tolerant:

Yes

Salt Tolerant:

Yes

Thorny:

Yes

Invasive:

Yes

Care Level:

Medium

watering

Swamp Thistle should be watered regularly with a deep soaking once per week to a depth of several inches. During the hot summer months, the plant may need more frequent watering and may benefit from a shallow layer of mulch to help retain soil moisture. From September to mid-July, the plant can survive with its natural rainfall or a once a week deep irrigation. Be sure to allow the soil to dry out between waterings.

sunlight

Swamp Thistle needs full sunlight more than 4-6 hours of strong, direct sunlight per day to thrive in a range of habitats, including moist soils in wet meadows, bogs, marshes, shorelines, and ditches. It grows best in consistently moist soil, but will tolerate short periods of inundation and longer droughts. Good growth and flowering generally occur from April to September.

pruning

Swamp Thistle (Cirsium muticum) should be pruned in late-spring or early-summer, after the plant has flowered and set seed. The extent of the pruning will depend on the desired size and shape of the plant, but generally you should trim back the stems moderately, removing any dead or diseased stems and cutting those that have become too long and/or crowded. It is also important to reduce the overall canopy size of the plant by removing any excessively long branches. Pruning should be done with sharp, sterile pruning shears to reduce the risk of introducing disease.

Season

Fall
Winter
Spring
Summer
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Harvest Fruit

Harvesting of Swamp Thistle fruits typically begins in late summer, usually in August or September.

Harvest Fruit

Harvesting of Swamp Thistle fruits typically begins in late summer, usually in August or September.