Friday, March 13, 2020

Cool Season Annuals for Mountain Gardens


Cool Season Annuals for Mountain Gardens
By Yvette Henson, San Miguel Basin CSU Extension

When I am scrolling through Instagram seeing lovely pictures of warm-season annuals like zinnias, Mexican sunflowers and tall annual sunflowers, I usually feel a longing to grow them too. I start thinking, “could I possibly grow them in my high elevation (8,400’) garden with cool night temperatures and short frost-free season?” Strategizing, “maybe I could start them early from seed and transplant them into a location with a warm microclimate” or “maybe I could grow them from seed in the garden and only save seed from the ones that do well in my garden-- if I do this selection for several years, I might have a variety that would work for me!” 

But in reality, for me, it makes much more sense to grow the things I can grow easily! I have the perfect garden for cool-season annuals! And if you garden in the mountains, you probably do too!

Following are just a few of the easiest cool-season annuals to grow:

Pansies, Viola x wittrockiana

My grandmother grew pansies in front of a stone retaining wall at her house in Telluride. She would let me pick an arm full of the cheery, fragrant blooms and put them in a cute glass frog vase.This photo is pansies in that vase.

Pansies, Viola x wittrockiana

In flower language, pansies are known for love, especially thoughts of love. Both the leaves and flowers are edible. They can be started from seed and set out in early spring, as soon as the snow melts. They can be planted out again in the late summer or fall. In my garden, I can usually just cut them back if they get leggy, and they will re-bloom.

For more about growing pansies and pansy varieties:



For info about very cold-hardy pansies check out the page for the CSU Annual Flower Trial Garden http://www.flowertrials.colostate.edu/trial_garden.php?category=Cool+Season

Calendula, pot marigold, Calendula officinalis

Calendula have cheery, large flowers that look similar to zinnias, but they only come in oranges and yellows. There are some recent selections that are more peachy-orange.  They are easy to start from seed, either as transplants or directly in the garden. Calendula should bloom the entire summer in a cool mountain garden. They also make a good cut flower.

Calendula, pot marigold, Calendula officinalis

Like pansies, they are edible, hence, the common name pot marigold. However, they are not the same species as what we commonly refer to as ‘marigolds’, which are Tagetes spp. Calendula is also used in making homemade salves that sooth the skin. They say the best variety for this is ‘Resina.’  Calendula is the British floral emblem for the month of October. 

For information on how to make a skin salve from Calendula flowers go to this blog:  https://theherbalacademy.com/how-to-make-calendula-salve/

Poppies, Papaver spp.

My grandmother also planted a small orange poppy mixed with her pansies. I haven’t been able to definitely figure out which species it was, but it could have been alpine poppies, because they were pretty small plants. However, some Icelandic poppies are short too. I took this photo of self-seeded poppies growing in an alley garden in Silverton last summer.   

Poppies, Papaver spp.

Annual poppies, like Papaver nudicaule, Papaver alpinus, Papaver somnifera, and Papaver rhoes do best in cool summers and alkaline soil. Choosing from these species will give a range in size and color, from white, pink, purple, yellow, orange and red. You can sow seeds into loose garden soil in the fall, or start transplants to set out in early spring. If they are in a happy location, they will re-seed. Some poppies make edible seeds. In flower folklore, poppies have many magical meanings and uses. 

There are so many different varieties of poppies we can grow. I recommend you do an internet search! 

Sweet peas, Lathyrus odoratus

WARNING: ornamental sweet peas are NOT edible!!! 

There are tall vining varieties as well as short varieties. They were so popular in the late 1800’s that breeders developed many colorful, large flowered varieties that sadly didn’t inherit the fragrance of their grandparents. Sweet peas with true sweet pea fragrance are still hard to find. Plant seeds in the early spring as soon as the ground can be worked. Soak them overnight first to soften the hard seed coat. 

Sweet peas, Lathyrus odoratus
Some varieties have longer stems that make good cut flowers. In the language of flowers, sweet peas mean “departure” or “adieu.” They are often considered the flower for April. 

Irene Shonle wrote a Colorado Mountain Gardener blog about sweet peas back in 2015.  To read it again, go here http://coloradomountaingardener.blogspot.com/2015/04/sweet-peas-by-irene-shonle.html


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