Leafy Thistle

The edible thistle requires moderate amounts of water, but should not be allowed to stand in soggy soil. Water the plant when the top inch of soil is dry. This typically occurs during the summer months at least once every 5 to 7 days, depending on temperature and humidity levels. In the winter months, every 2 or 3 weeks should be adequate. Apply enough water that it seeps down to the roots, but not so much that it pools in the pot.

Edible Thistle (Cirsium edule) requires full sun exposures of 6 to 8 hours each day for optimum growth and health. It thrives best when exposed to direct sunlight from late morning to mid-afternoon; however, morning shade or partial shade is recommended during periods of extreme heat or extended periods of exposure to direct sunlight. While Edible Thistle does like direct light, it also benefits from indirect or filtered light for at least part of the day.

Edible Thistle should be pruned in late winter or early spring. Pruning should take place just before the new growth begins. Any dead or damaged stems should be either removed completely or pruned back to a healthy location. Any stems or branches that are overcrowded or crossing over each other should also be pruned. Pruning should be done lightly in order to maintain the natural shape of the plant. Once pruned, the shearing of the edible thistle plants should be done twice a year, once in mid spring and once in mid autumn. Doing this will help promote a bushy and fuller plant.