Articles, Flower Gardens, Flower Guides, Landscaping

Sweet PeasSunlight: Full sun
Maturity: 55-75 days from seed to flower
Height: 48 to 72 inches
Spacing: 4 to 6 inches apart in all directions

A great climber that’s perfect for fences and trellises! Home flower gardeners are growing sweet peas for their tantalizing fragrance and captivating blossoms. Easy to plant from seed, they add a splash of color to any garden, especially in cool, damp climates.

These classic, cool-season annuals have been a fixture in American gardens for generations. However, they don’t like heat — hot weather stops their flowering — so plant very early and mulch well to keep roots cool. This hardy annual is one of the very first seeds that can be planted in the garden.


Sweet Pea

Sweet Pea Seeds

Uniquely shaped and sweetly fragrant, sweet pea blossoms add color to summer gardens.

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Tired of the same old flowers? Heirloom seeds — the ones that Grandma used to grow — add charm to your garden while stirring memories with their abundant blossoms and arousing scents. Best of all, we ship them FREE!

Quick Guide

  • Select your favorite color: pink, blue, purple, red and more
  • Direct seed in very early spring, as soon as soil can be worked
  • Plant in full sun and soil amended with compost or organic matter
  • Water regularly; plants will slow growth in hot weather
  • Pests and diseases include aphids, slugs and powdery mildew

Site Preparation

Sweet peas like a rich, well-drained soil but will tolerate various conditions. Soak seeds before planting to improve germination. Sow directly into the soil, about 4-6 inches apart and cover with 1/2 inch of soil.

How to Plant

Sow sweet pea seeds as soon as the soil can be worked for summer bloom. The seed casings are hard, so soak overnight for best germination. Sweet peas like full sun and cool weather.

Water regularly during dry conditions to keep them blooming. Fertilize a couple times during the gardening season with an organic flower fertilizer designed for more abundant blooms.

Vining sweet peas (the majority) need a support to climb, so provide them some sort of trellis. Once the vines begin blooming, cut the flowers and bring them inside to enjoy. The more you cut, the more flowers will grow.

As the weather begins to warm, flower production will slow. When flower production stops and the vines begin to dry, chop the foliage and turn it into the existing soil as a free source of organic nitrogen. Keep in mind that sweet peas, though an annual, will reseed and appear again the following spring.

For more tips on creating a gorgeous flower displays, watch our 6 Tips for Great Flowers video.

Tip: Long-time gardeners in New England often plant sweet peas around St. Patrick’s Day.

Insects and Disease

Slugs and aphids will occasionally attack foliage and flowers. Watch closely and apply diatomaceous earth or other OMRI listed pesticide if aphids are found.

Large irregular holes in foliage and partially eaten seedlings are signs of slug damage. Scatter Sluggo®, an organic iron phosphate bait, around plants to kill slugs and snails without harming people, pets or wildlife.

In wet, cool weather mildew and plant diseases abound. If wilting, spots or rotted tissue are noticed, we recommend the following:

  • Avoid overhead watering whenever possible (use soaker hoses or drip irrigation)
  • Properly space plants to improve air circulation
  • Apply copper spray or sulfur dust to prevent further infection

Note: Sweet pea flowers are popular with beneficial insects such as ladybugs, lacewing and butterflies.

Seed Saving Instructions

Sweet peas should be separated by 25 feet to ensure absolute purity. Wait for the pods to dry before picking. Seed pods will burst, so picking in a timely manner is critical. Read our article on Saving Heirloom Flower Seeds to learn more.

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