Saturday, June 18, 2016

Portulca – a sparkling summer annual flower that takes the heat


The annual flowering plant known as Portulaca is a well-known favorite found in all garden centers.  This plant is particularly successful here as it takes the heat and full sun of summer.  The sparking, florescent flowers produced by the Portulaca are new every day.  Should this flower be in your garden?

To begin, there are several species of Portulaca which tend to get lumped together.  For instance, Portulaca grandiflora has a cylindrical leaf (almost needle-like) and is commonly called the moss rose.  Another species is Portulaca oleracea which has a flat leaf and is most commonly called purslane.  While some varieties of purslane are ornamental, some are known for their edible qualities.  Some purslane may even show up in your yard as weed!  Just to keep it simple, let’s call of these just plain Portulaca. 

As a general statement, Portulaca have bright colored flowers ranging from red to yellow, orange, pink and white in both single and double flowering forms.  There are even some with attractive bicolor flowers with spots and stipes of other colors.  Most if not all of these have a habit of opening when the sun is bright and closing on cloudy days.  Newer cultivars such as ‘Sundance’ and ‘Afternoon Delight’ were developed to stay open longer on into the afternoon as well as in cloudier weather.  The use of Portulaca as a groundcover works well as most are barely six-inches tall and around twelve- inches wide.  Best sites for the annual include those in full sun and well-drained soil. 

Portulaca seeds are available and very easy to germinate.  The seeds are very small, so plant enough in sterile potting medium in pots to transplant later to the final bed, or start them direct-seeded where you intend them to grow.  Established plants will produce thousands of seeds which may volunteer the next year.  Cuttings can also be rooted to expand your planting stock. 

One note on the edible varieties grown specifically as a vegetable.   Just like the ornamental types, the leaves are very fleshy and succulent.  They also tend to have smaller yellow flowers.  Cultivated varieties are available from some seed catalogs if you are interested.  The plants are eaten raw or cooked and are said to taste like watercress or spinach.  The tiny seeds are also reported to be edible. 

If you have had no success with other summer flowering annuals, the Portulaca is sure not to disappoint!  For more information on all types of summer-hardy flowers, please call our Master Gardener volunteers on the Plant Lifeline on Mondays, Wednesdays and Fridays from 1 to 4 pm at 764-4340 for gardening help and insight into their role as an Extension volunteer.  Don't forget to visit our other County Plant Clinics in the area.  Please check this link for a complete list of site locations, dates and times - http://charlotte.ifas.ufl.edu/horticulture/Plant%20Clinics%20Schedule.pdf.

Resources:
Gilman, E. F. & Howe, T. (1999) Portulaca grandiflora. The University of Florida Extension Service, IFAS.
Stephens, J. M. (2015) Purslane - Portulaca oleracea. The University of Florida Extension Service, IFAS.
Christman, S. (2014) Portulaca oleracea. Floridata.com, Tallahassee, Fl.
Christman, S. (2003) Portulaca grandiflora. Floridata.com, Tallahassee, Fl.
Mason, S. (2016) Purslane – Weed It or Eat It? University of Illinois Extension Service.  University of Illinois at Urbana-Champaign 

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