Plant Care Cow Poison

Cow Poison

Also known as

cow poison, poison delphinium and Columbian larkspur


Delphinium trolliifolium

How to care for Cow Poison


How often to water your Cow Poison

Water needs for Cow Poison
0.5 cups
every 9

Cow Poison 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.

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 Cow Poison in your home

Light needs and placement for plant Cow Poison: 1ft from a window
1ft or less from
a window

Cow Poison love being close to bright, sunny windows 😎.

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

Cow Poison does not tolerate low-light 🚫.

Select your region to see how the current weather in your area affects the placement of Cow Poison in your home 🏡.


How to fertilize Cow Poison

Nutrient, fertilizer, and repotting needs for Cow Poison: 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 Cow Poison after it doubles in size or once a year—whichever comes first.

Water Needs
Sunlight Needs
Growth Pattern

Care Summary for Cow Poison

Cow Poison

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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