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How to Grow a Sweet Pea Arch

Published on January 17, 2024 โ™› By Melissa J. Will

This post contains affiliate links.
Read full disclosure statement here.

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Make a sweet pea arch using these step-by-step DIY instructions. Use willow rods to create a beautiful, scented floral archway for your garden.

This project is from the book, Gardening on a Shoestring: 100 Fun Upcycled Garden Projects by Alex Mitchell. Also see her living succulent picture frame art here.

Sweet pea arch in garden.

How to Make a Sweet Pea Tunnel Garden Arch

Sweet pea garden arch from the book, Gardening on a Shoestring.

This selection from Gardening on a Shoestring is used with permission from Cool Springs Press who also provided a review copy of the book. 

This project uses willow rods. If they are not available in your area, ask for alternate suggestions at a local garden nursery or garden club. What you choose may depend on whether you want the arch to last for just one season or many years to come.

Materials

  • Brown, soaked willow rods (not living or green since this may root).
    For every three feet of tunnel you will need around 40 rods each about 9 feet long.
    If the tunnel is for children, they could be a little shorter.
  • Garden twine
  • Scissors
  • Sweet pea vine seeds (Botanical Interests)
    Be sure to choose non-invasive sweet peas. See the buying tips in Resources.

When to Sow Sweet Pea Seeds

There are a few options for timing your seed starting:

1   Start indoors late winter / early spring (8-10 weeks before last frost).
2   Sow directly outdoors early spring (6 weeks before last frost).
3   Sow directly outdoors in autumn: recommended for mild winter climates where the ground does not freeze.

The optimum soil temperature for sowing sweet pea seeds is 55-65ยฐF (13-18ยฐC).


Pink sweet pea flowers growing in the garden.

Related: How to Grow Sweet Peas


Placing willow rods to create a sweet pea arch.
ยฉ2016 – Gardening on a Shoestring by Alex Mitchell

How to Do It

  • Push the thick ends of the rods into the ground on either side of the path, spacing them more or less equally, at a distance of about 3 inches apart.
  • Now bend over the tops of each opposing pair so they meet in the middle.
  • When you are happy with the height of the tunnel, tie the rods together at that point to form a series of arches.
  • Strengthen the top of the tunnel by twirling any thin ends left over around the opposite rod and typing in the ends securely.

Sweet pea flowers and seed pods.

Related: How to Save Sweet Pea Seeds


Next Steps

Detail of woven willow rods for a sweet pea arch.
ยฉ2016 – Gardening on a Shoestring by Alex Mitchell
  • Now strengthen the sides of the tunnel and give your sweet peas plenty of horizontal supports to climb.
  • Make sure the rods have been soaked so they are sufficiently flexible.
  • Take a rod and carefully weave it horizontally through all the uprights, about 8 inches from the ground.
  • If it doesnโ€™t reach all the way to the end of the tunnel, continue with a new rod, tying any loose ends as you go.
  • Repeat just above the first lateral, but this time weaving in the alternate pattern to create a strong bond.
  • Weave in a further rod so you have three laterals and then repeat this on the other side of the tunnel.
  • Weave in two further groups of laterals on each side, at about 16 inch intervals, so that the tunnel feels strong and secure.

Sowing Time

Now you are ready to sow your sweet peas.

It is recommended to first soak the seeds in moist paper towel for a day or in a cup of warm water. Recommended soaking times vary. Some gardeners find just 30 minutes is enough while others go up to 24 hours. Test some and see what works for you.

Sweet pea garden arch with lots of colorful sweet pea flowers and vines.
ยฉ2016 – Gardening on a Shoestring by Alex Mitchell
  • Space seeds about 2 inches apart along the base of the tunnel on each side.
  • You want a profusion of color, so really pack in the seeds.
  • Water well and protect the seedlings from slugs and snails until they are established.
  • Tie in the stems to the supports as they grow to help them along and when they start flowering, keep picking to encourage them to produce more blooms.

After flowering, use these tips for collecting sweet pea seeds for next year.

Resources

Get the Book

Gardening on a Shoestring by Alex Mitchell

Gardening on a Shoestring
100 Fun Upcycled Garden Projects

by Alex Mitchell

See it on Amazon

Growing a pretty garden doesn’t have to cost a pretty penny–learn how to create a low-cost garden using a little elbow grease, a lot of creativity, and this book.

When I first shared Gardening on a Shoestring with the DIY Succulent Wall Planter tutorial, I mentioned that the book had me at hello. With just a few page flips, I couldnโ€™t wait to dig in.

The book features 100 fun, upcycled garden projects and thereโ€™s all sorts of great ideas including frugal and fabulous garden containers, propagating plants (free new plants from the ones you already have), smart choices for garden supplies (without wasting money), and keeping your garden healthy (for next to nothing). The photographs are lovely and everything comes with creative twists that make us love gardening just a little bit more.

This project, the sweet pea garden arch, is a fun idea for a spot in the garden where you might like a secret pathway leading to something special. If you have children, itโ€™s just an all-round fun play place, and you could aim it toward their own little garden sitting area, picnic spot, or veg garden. As it fills in, it will become the most beautiful, naturally-scented tunnel with all those reds, pinks, and purples. In the book, Alex suggests it as a pathway to the trampoline which sounds like a fine idea.

Seed Buying Tips

Sweet pea vine seeds are available as annuals and perennials.

Avoid the perennial type, known as Everlasting Sweet Pea, which can be invasive.

You want to get annual sweet pea seeds that grow as vines (usually 5-6 feet tall).

Sweet pea seed packets.

Sweet Pea Seeds | Botanical Interests

Sweet Peas | Genus: Lathyrus

Purple sweet pea flowers.

Flowering plant or vine | Tips For Hardiness Zones 4-8
โ€ข Annual hardiness zones 7 up
โ€ข Perennial L. latifolius is invasive
โ€ข Sow seeds indoors 8-10 weeks before last frost and transplant after last frost or direct sow 6 weeks before last frost.
โ€ข Fall sowing is also possible in a heated greenhouse.
โ€ข Best Light: 6 hours morning sun
โ€ข Well-draining soil, rich in compost
โ€ข Do best in moderate summer temperatures, not heat
โ€ข Cut flowers: 4 to 5 days with preservative in vase water
โ€ข Seeds can be harvested for seed saving

  • Sweet Pea Growing Guide

Shop Online:

  • Sweet Pea Seeds | Botanical Interests (US Shipping)
  • Sweet Pea Seeds | West Coast Seeds (CAD Shipping)

~Melissa the Empress of Dirt โ™›

Sweet pea garden arch from the book, Gardening on a Shoestring.
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How to Grow a Sweet Pea Garden Arch

Instructions for growing a living garden arch using willow branches and sweet pea flowers.
Total Time2 hours hrs
Author: Melissa J. Will
Cost: $30

Equipment

  • Twine

Supplies & Materials

  • 50 Sweet Pea Seeds Annual, climbing, presoaked in water to soften the seed coats
  • 40 Willow rods – 9 feet long soaked in water

Instructions

  • Push thick ends of willow rods into ground on either side of path, spacing them equally approximately 3-inches apart.
    40 Willow rods – 9 feet long
  • Bend over tops of each opposing pair so they meet in the middle.
  • Tie rods securely together with twine so they form a series of arches.
  • Weave additional rods horizontally through the vertical rods near base for extra strength.
  • Sow seeds 2-inches apart along the base of each side.
    50 Sweet Pea Seeds
  • Water well and protect from slugs and snails.
  • Use twine to support sweet pea vine as it grows.
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Sweet pea garden arch from the book, Gardening on a Shoestring.
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Melissa J. Will - Empress of DirtWelcome!
I’m Melissa J. Will a.k.a. the Empress of Dirt (Ontario, Canada).
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