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Sweet pea, magnificent annuals

Sweet pea
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Finely drawn pink-purple flowers with a delicate fragrance, carried on a vine that hauls itself 6½ to 16 feet up a lattice or a set of poles: sweet pea (Lathyrus odoratus) is grown as a scented screen or miniature hedge. Give it full sun and rather rich soil, and it flowers on and on.

Sweet pea at a glance
Name Lathyrus odoratus
Family Fabaceae
Type climbing vine
Height 6 ½ to 16 feet (2 to 5 meters)
Exposure full sun
Soil ordinary
Foliage deciduous
Flowering late spring to mid-autumn depending on the variety

Its finely drawn flowers and its delicate fragrance makes it one of the most beautiful annuals.

Try growing sweet pea once, and you will never regret it…

Planting, sowing sweet pea

Even though sweet pea isn’t a very demanding plant, it still is at its best in rather rich soil.

If you purchase your sweet pea in a nursery pot, don’t transplant it to the ground until the end of spring.

Sowing sweet pea from seed

How to sow and plant sweet pea
Soaking the seed first wakes it up before sowing

If you’re looking to sow your seeds yourself, sow directly in the plot as soon as spring arrives for it to bloom in summer.

  • If you sow any earlier, best anticipate and sow under cover.
  • Soak your seeds in water for 12 hours before sowing them to trigger their waking up.

A good combination is to sow some of the seeds in a sheltered spot in winter, and the other part at the beginning of spring, directly in the ground. That way, you’ll have two different blooming seasons.

Three ways to start sweet pea, and when

Sweet pea can be sown straight into the plot, started earlier under cover, or bought ready-grown in a nursery pot. The starting method decides when you plant and when you get flowers.

Three ways to start sweet pea, and when
Method When Where Key point
Direct sowing Early spring Straight into the plot Blooms the following summer
Sowing under cover Midwinter to late winter A sheltered spot, under cover Combined with a spring sowing, gives two blooming seasons
Nursery-pot plant Late spring Transplanted to the ground Wait until the end of spring before planting out

Whichever route you choose, soaking the seed first gets germination away to a quicker start.

Pruning and caring for sweet pea

Remove dead flowers as they appear, in order to boost flower-bearing during the entire blooming season.

  • Tether the sweet pea stems to their lattice or poles to help them climb.
  • Check that your plant isn’t run over by slugs.
  • In case aphids start attacking, here is what you need to do to fight against aphids.

All there is to know about sweet pea

Diseases and pests that affect various sweet pea species
Bound to a lattice, it becomes a fragrant hedge

Sweet pea is sold both as annuals and perennials (this depends on the climate since it dies when freezing occurs) and has very beautiful pink purple flowers.

This fragrant plant adapts perfectly to growing along a lattice to which it will bind itself to, covering a wall or turning into a very fragrant miniature hedge.

Smart tip about sweet pea

To increase blooming, add cocoa hull mulch. It is both trendily aesthetic and at the same time a great fertilizer!


Written by Gaspard Lorthiois | Loves helping out, especially when it comes to growing things. Worked in herbal medicine, runs a farm, and dabbles in tech. Master's degree and engineer.