Wavy Leaved Thistle

Wavy Leaved Thistle requires regular watering. During the growing season, it needs to be watered once to twice a week, so as to keep the soil consistently moist at approximately 2''-4'' deep. During especially warm weather or periods of drought, additional water may be required. When watering, it is important to avoid over watering or saturating the soil as doing so can lead to root rot. During the winter, it should only be watered every 2 weeks (or even less depending upon the restrictions of your climate).

Wavy Leaved Thistle needs full sun in order to thrive. They should get at least 6 to 8 hours of direct sunlight per day. They should be placed in an area that will not be shaded for most of the day. In the summer, they should receive plenty of direct sunlight and should be placed in a spot that receives full sun all day long. For optimal growth, they should be placed in a location that receives intense morning sunlight and mild afternoon sunlight. In the winter, they should receive less direct sunlight, but still need plenty of light.

It is recommended to prune Wavy Leaved Thistle (Cirsium undulatum) during the early spring, before the growing season starts. As with most pruning, the main goal is to remove dead, damaged, or diseased stems and branches. In addition, any branches that are crossing each other, growing too low, or growing too close to the ground, should also be removed. The stems should be cut back to the desired shape or to where the healthy and vigorous growth begins. It is also recommended not to prune more than ⅓ of the plant’s total growth in 1 season to avoid damaging the plant's root system.