Smooth Sow Thistle

Smooth Sow Thistle prefers for the soil to dry out between waterings and should be watered regularly. Use our water calculator to personalize watering recommendations to your environment or download Greg for more advanced recommendations for all of your plants.

Smooth Sow Thistle requires abundant, bright and direct light. Place it less than one foot from a window to ensure it receives enough light to survive 💪. Select your region to see how the current weather in your area affects the placement in your home 🏡.

Greg does not have confirmed data on this plant’s toxicity. If you, a family member, or a pet consumes plant material of unknown toxicity, it’s always best to consult a medical professional.

If you or someone else ingested this plant, call Poison Control at US (800) 222-1222. If a pet consumed this plant, contact your veterinarian or the ASPCA at US (888) 426-4435.

Smooth Sow Thistle does best in well-draining soil. A good soil will contain lots of organic matter such as coco coir as well as perlite or vermiculite to help with drainage. Adding a handful of perlite to regular store-bought potting soil should do the trick!

Smooth Sow Thistle should be repotted after it doubles in size or once a year, whichever comes first. Fresh potting soil has all the nutrients your plant needs, so as long as it’s refreshed yearly, you shouldn’t need to use fertilizer. Remember, plants get their energy from sunlight, not fertilizer!

Smooth Sow Thistle grows vertically and new growth will emerge from the top of the plant.

USDA Hardiness Zone
Smooth Sow Thistle can be grown outdoors in USDA Hardiness Zones 6a-9b. Find your local hardiness zone here.

The seeds of Smooth Sow Thistle can be used to grow new plants! After your plant flowers, any seeds that formed can be collected and germinated in potting soil.