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Growing Sweet Peas

Sweet Peas

Knowing how to grow sweet peas is important for success with these fragrant beauties. Unless you live in an ideal climate with long cool summers there is not much point in hoping to have enormous flowers and luxuriant 9 foot plants. But you can have masses of cut flowers for at least six weeks in spring and early summer, and that is enough compensation for any trouble they might be.

Sweet peas can be grown, and will flower, if you just put the seeds in the ground and give them some support. However, the best results are obtained by preparing the soil in the fall. 

Spring sowing must be very early, usually before the frost is out of the ground and before it is any condition to be worked. Dig the ground in the fall to the depth of about a foot and if you have some good compost or manure, mix it with the soil to increase the capacity to hold moisture. 

Sweet peas require alkaline conditions. In regions with acid soil, the easiest procedure is to sprinkle enough lime on the surface to give a light-powdered appearance. They like moisture – 1" a week, with one good soaking is best.

When to Plant

  • California – August to September for early spring bloom, November to January for summer bloom.
  • Southwest, S. Texas, S. Florida – September and October
  • Lower Southern states – November, December, January
  • All other areas – February through April

Sowing Instructions

Sow outdoors 1-1 ½ " deep and an inch apart. Plant seeds in a double row with a 6" space between, that way if the weather is too wet and seeds rot, gaps will not show. They often take 3-4 weeks to germinate.

I prefer sowing indoors in germinating mix in fiber pots 3 weeks before setting outdoors. That way, germination is quick and sure. Soak the seeds overnight before sowing. Transplant fiber pot and all.

Care and Cultivation

Sweet Pea

The plants, being vines, require support to flourish and flower. I use brush or convenient trellis netting. They do best in a sunny spot that receives some afternoon shade. They need fertilizing every 2 weeks with organic fertilizer or manure tea, and mulching with grass clippings or other mulch to keep the roots cool. The flowers should be cut every few days to encourage continuing bloom, a certain delight!

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