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Marsh Marigold (aka Cowslip)

Latin Name: Caltha palustris

Not actually a Marigold but rather a member of the Buttercup family!


Naturalizing, mounding perennial native to areas in North America (see map below for range) that attracts butterflies, hummingbirds and other pollinators.

● Canadian Hardiness Zone: 3-7 (ONP)

(USDA Zone: 3-7, according to MBG)

● Plant Type: Perennial

● Bloom Time: April-June (and again later in Summer if protected from extreme heat)

● Bloom Colour: Yellow

● Maintenance: Low

● Water Use: High (prefers wet soils)

"If I buy you, bring you home, stick you in the ground, water you and love you -

and you DIE on me - either I didn't do my research OR - you're a sh*t plant."

- a Motivational Speech for plants



What makes this plant beneficial to people, places, animals or our environment?

  • Easy to grow from seed (use stratification techniques) and seed pods create visual interest in the garden (see image below).

  • Excellent source of food for a range of pollinators

  • Native

  • Will help keep pond water clear as it feeds off the same nitrates as algae!



What does it LOOK like?

Yellow bloom in Spring and again in Summer if protected from extreme heat

Mounding habit

Dark green foliage makes the yellow flowers POP!

Height & Spread: 1-1.5 feet


Photo Credit: EverWilde Farms Inc.


Ideal Growing Conditions

Where does it GROW?

Ponds & Wet Areas

Hollow stems will float in water making this an excellent choice for rain gardens or ponds.


Flowers best in full sun though prefers part shade and protection from extreme heat.



Does this plant attract deer, mosquitos or Japanese beetles? Is it susceptible to blight, leaf spot or root rot?

Deer & Rabbit - tolerant


Photo Credit: MBG


In the Garden/Home/Landscape

Why did I choose to spend my time writing about this particular plant?

  • The little yellow flowers against the dark green foliage is stunning to look at!

  • Excellent for wet areas!

  • Native species that provides a source of food for a multitude of pollinators!


Tips, Tricks and Notes

  1. In Latin, "Caltha" means "cup" and "palustris" means "of the swamp".

  2. POISONOUS! No part of this plant should be consumed raw (though there are references to eating this plant after being boiled - which I DO NOT recommend)


Other Resources:


This is just one plant of SO MANY!

Stay tuned for a new post each week that summarizes an Annual, Perennial, Bulb, Shrub or Tree!


Weekly #FridayFeatureFlower At the top is the pep talk I give my new plants before purchasing them.

I have had a lot dead plants and broken-hearts over the years and I hope that this weekly feature will provide a bit of the research side to help others from suffering my same fate.


The main focus of this blog is plants that thrive outdoors in Southwestern Ontario.

Each week, I’ll review benefits, characteristics, growing conditions, Pests/Diseases/Issues and landscape/garden design applications of one of my favourite, high-impact, low-maintenance plants!

I want your Feedback!

Have you had a different experience with this plant?

Love it? Hate it? Want to know where you can find it? Is there a plant or flower you would like to know more about?

Leave your comments below

or contact me through my website:

Heather Jerrard, My Landscape Artist

Follow me on Instagram! @mylandscapeartist


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