Wednesday, July 29, 2015

Sunshine Mimosa - Mimosa strigillosa

Sunshine mimosa (Mimosa strigillosa) is an evergreen perennial ground cover native to most of Florida, except the western half of the Panhandle.  It also is documented in the states immediately north and west of us, Georgia to Texas except Alabama.  It most commonly is resident to moist open habitats and in disturbed sites, though it is widely used as an ornamental ground cover and can escape from planted landscapes.
Sunshine mimosa is extremely hardy and spreads aggressively. It sends a great many stems (stolons) out in all directions from the main stem and they root periodically at the leaf nodes. The reddish stems and deep green foliage hug the ground and rarely stand more than 3-4 inches tall.  In sunny locations, this makes a dense ground cover and this plant is often used as an alternative to turf grass. Sunshine mimosa is a legume and it exhibits the typical pinnately compound foliage.  The leaves are sensitive to touch as they also are for other members of this genus. The foliage also serves as one of many host plants for the Little Yellow butterfly.
Like other members of this genus, sunshine mimosa produces pink "powder puff" blooms. These are produced on single stems along the length of the runners and they stand about 6 inches above the foliage beneath. Flowering occurs from spring through fall and each bloom remains intact for more than a week. There are no petals; the pink blooms are composed only of the male and female reproductive parts. They are moderately visited by small pollinating insects.
Sunshine mimosa can be a curse or a godsend in the landscape depending on the setting and the goals you have for it. Though naturally present in moist soil habitats, it is extremely drought tolerant and adaptable to nearly any soil type. Its roots are stout and woody, and reach several feet deep into the soil column.  Over time, its spreading habit and dense foliage (which is reduced in winter, but still present) form a dense cover that limits weeds and unwanted plants, but also out-competes most other desirable wildflowers. Therefore, it does not make a good addition to a mixed wildflower garden. Its aggressive nature also makes it difficult to contain unless surrounded by concrete or asphalt.  The few plants added to our landscape by my wife over a decade ago, quickly left our yard and now comprise most of our next door neighbor's yard, from our property line all the way to his driveway, 50 feet away. As they are not gardeners, they are happy to have this low-maintenance "lawn". If it had been another neighbor, however, we might have caused problems. Sunshine mimosa can be contained also by shade.  It greatly prefers full or half-day sun and fizzles out beneath a shady canopy.
In the right location, this is a very valuable and attractive ground cover. Because of this, it is widely propagated and should be easy to find at commercial nurseries - even ones that don't specifically carry native plants. Just make sure that your landscape goals will not conflict with this plant's growth habit.


  1. Wait… I’m confused. You said: “ The leaves are not sensitive to touch as is that of sensitive briar (Mimosa quadrivalvis)…” My sunshine mimosa leaves are most definitely sensitive and will close themselves up due to the slightest touch. Did you mean to say that sunshine mimosa is not AS sensitive as sensitive briar?
    Thank you.

    1. I had not noticed that with mine, though I'll admit that I didn't experiment. Thanks for your correction and I'll change my post.


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