Leafy Thistle

Leafy Thistle (Cirsium foliosum) should be watered only when the soil is dry. This means that the plant should be checked every few days to ensure the soil is on the dry side before watering. The plant should be given a thorough watering at least once a week in the warmer months, providing that the top 1 inch of soil is dry. In the cooler months, reduce water to every 2 weeks. Over-watering should be avoided as it can lead to root rot.

Leafy Thistle is native to western North America and can be found in grasslands, rocky slopes, and hillsides. It requires full sunlight and can tolerate some light shade. During the summer months, it will need at least 6-8 hours of direct sun daily for optimal growth. In shadier locations, the amount of sunlight needed should be increased to 8-10 hours per day. During the spring and fall months, the hours of sunlight can be decreased as long as the plant still receives at least 4-6 hours of direct sunlight. During winter months, the plant can tolerate less sun as a result of day light hours being significantly shorter.

Leafy Thistle (Cirsium foliosum) should be pruned in the spring, though light pruning can take place throughout the year. Pruning should remove dead and damaged branches and stems as well as any overcrowded branches and shoots. High pruning can also be done in the spring to keep the plant from growing too tall. Pruning encourages a bushier, more compact growth habit making the plant more attractive and allowing more sun and air circulation into the center. Prune as much as necessary to achieve the desired shape, being careful not to prune away too much of the plant’s foliage and flowers.