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When and how to plant sweet peas – Six tips for spring gardening

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Sweet peas are the perfect plant for any garden, easy to grow from seed to give a colourful burst to your green space.  Sweet peas – Lathyrus odoratus – live for just a year, dying after they set seed. There are many different types of sweet peas, so doing some research on which will best suit your space may be a good idea before purchasing seeds.

For example, the ‘Spencer Mix’ sweet pea has large flowers and long stems however the ‘Cupani’ and ‘Painted Lady’ types have shorter stems and a distinctive scent.

Sweet peas are a flowering plant native to Sicily, southern Italy and the Aegean Islands.

They are an annual climbing plant and can grow to a height of 1 to 2 metres (3 ft 3 in–6 ft 7 in), where suitable support is available.

Often they are grown against a trellis or with support such as rods or canes.

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This can be a trellis, bamboo canes or some other sturdy pole structure.

This is not a step to miss, as your plants can grow up to two metres tall if supported properly.

The RHS advises tying new shoots of climbing plants to canes, pea sticks, netting, trellis or shoots of shrubs they will be growing up.

You can do this using garden twine or sweet pea support rings.

Once in contact with the supports, the tendrils of the plant “will naturally begin to grip on but keep tying in new shoots if they are wayward or in danger of breaking.”

In terms of looking after your plants as they grow, you need to make sure the ground is watered every three to four days when the weather is dry.

Sweet peas won’t give good flowers if they dry out, so pour on enough water to wet the full depth of roots each time you water.

If your soil is light or infertile, the RHS advises appling a high potassium liquid fertiliser, such as tomato feed, once or twice a week.

Fertilising the soil, especially if your soil is light, will help maintain flowering, especially with annual sweet peas.

Once the autumn arrives you can cut perennial sweet peas back to ground level or leave the cutting back until February so the dead stems can aid wildlife in winter.

You can also pull out and compost annual sweet peas once flowering has finished at the end of summer.

If you see a hot or especially dry season you may have to pull out your plants sooner than this.



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