Plant Care Smooth Sow Thistle

Smooth Sow Thistle

Also known as

Common Sowthistle, Common Sowthistle, Sow thistle, Common sowthistle, Smooth sow thistle, Annual sow thistle, Hare's colwort, Hare's thistle, Milky tassel, Milk thistle, Soft thistle and Swinies


Sonchus oleraceus

How to care for Smooth Sow Thistle


How often to water your Smooth Sow Thistle

Water needs for Smooth Sow Thistle
0.5 cups
every 9

Smooth Sow Thistle needs 0.5 cups of water every 9 when it doesn’t get direct sunlight and is potted in a 5" pot.

Use our water calculator to personalize watering recommendations to your environment or download Greg for more advanced recommendations for all of your plants.

Calculate water needs of Smooth Sow Thistle

Water 0.5 cups every

Does your plant get direct sunlight?

Select the pot size


Check the growing potential in your area

A plant's growing potential is determined from its location, the time of year, and current local weather.

Select a city to check sunlight intensity

Finding light for Common Sowthistle in your home

Light needs and placement for plant Smooth Sow Thistle: 1ft from a window
1ft or less from
a window

Smooth Sow Thistle love being close to bright, sunny windows 😎.

Place it less than 1ft from a south-facing window to maximize the potential for growth.

Smooth Sow Thistle does not tolerate low-light 🚫.

Select your region to see how the current weather in your area affects the placement of Smooth Sow Thistle in your home 🏡.


How to fertilize Smooth Sow Thistle

Nutrient, fertilizer, and repotting needs for Smooth Sow Thistle: repot after 2X growth

Most potting soils come with ample nutrients which plants use to produce new growth.

By the time your plant has depleted the nutrients in its soil it’s likely grown enough to need a larger pot anyway.

To replenish this plant's nutrients, repot your Smooth Sow Thistle after it doubles in size or once a year—whichever comes first.

Difficulty Level

Smooth Sow Thistle is generally considered an easy-to-care-for plant and makes a great choice for beginners!

Water Needs
Sunlight Needs
Growth Pattern
Growing Outdoors

Care Summary for Smooth Sow Thistle

Smooth Sow Thistle

Smooth Sow Thistle

Greg recommends:


0.5 cups every 9 days


< 1ft from a window


Repot after 2x growth

Based on the 4” pot your plant is in, and that it doesn’t get direct sunlight.

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