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Gardener's Notebook: So what is Irish moss?

Happy St. Patrick’s Day! We quite often see pictures of gardens with a lush green groundcover, surrounding statuary and looking very exotic, and the photo’s caption often says that the plant in question is “Irish moss”.
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Happy St. Patrick’s Day!  We quite often see pictures of gardens with a lush green groundcover, surrounding statuary and looking very exotic, and the photo’s caption often says that the plant in question is “Irish moss”.  What is Irish moss?

I found some very interesting information while I did homework to learn about Irish moss.  First of all, Irish moss it not a moss at all, but a member of the pearlwort family, and has the fancier name “sagina subulata”.  Irish moss could easily be confused as a moss, because it is low growing, likes moist growing conditions, forms a thick growing habit, and does well in part-shade or sunny areas.  For added interest, the plant has dainty white flowers. 

The plant loves soil with good drainage, and while it likes moist soil, it does not like wet soil.  The plant does not like wet feet, so well-drained soil watered regularly is better than a constantly wet location.  And while the plant will grow in sun, it isn’t one of those plants that yearn to be in the blazing sun.

It is a beautiful plant once it is established, and guess what, we can even grow it in containers (but it will have to be planted in the garden before fall weather sets in, it won’t survive winter in a container).  It will produce more family members from seed.

But…there is a true Irish moss, and it is not what you think!  True Irish moss is not moss at all, but algae!  The lovely name “chondrus crispus” is Irish moss, red algae that grows in the cold waters of the Atlantic, common along the rocky and beautiful shores of Ireland.  Aside from СƵ plentiful in that location, that is not its main claim to fame.  It is known because it has a gelatinous substance in it called carrageenan which is used to stabilize and thicken ice cream or milk.

So there is Irish moss that is not really a moss, and Irish moss that is actually an algae.

Just like the beautiful symbol of St. Patrick’s Day, the shamrock, is not the clover that we expect, but is usually the oxalis plant, part of the wood sorrel family.  `Tis true, it’s not a lot of blarney for gardeners, but we may need the luck of the leprechauns to sort it out!

 Here’s more horticultural trivia about St. Patrick’s Day.  Green is the lucky color, and this even extends to the food we eat on this holiday.  The idea is that good luck will come to us if we eat green leafy food like kale, cabbage or lettuce.   It’s good for us, too!

And did you know that in the US, it has been a tradition that the president receives a beautiful Irish crystal bowl filled with shamrock from Ireland’s leader.   More holiday lore:  keeping with the color green СƵ popular, Mrs. Obama began the tradition of green water in the White House fountain on St. Paddy’s Day. 

The Yorkton and District Horticultural Society is still without meetings, but looking ahead with hope to when we can gather again!  Visit us at to find out what’s new!

“May you always find three welcomes in life:  in a garden during summer, at a hearth during winter, and in the hearts of friends throughout all your years.”  Happy St. Patrick’s Day!

Thank you to our friends at the Yorkton This Week for their great work; let`s pray for health for all and bright spring days on the horizon!  Have a great week!

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