Growing Sweet Peas Indoors

Growing Sweet Peas Indoors

Last Updated On: January 26, 2022

Sweet peas are a beautiful and delicious plant that are great for indoor growing. They are quite unique in that they have beautiful flower blooms, but are also edible. If you want to grow your own food, but don’t want to sacrifice beauty to do so, sweet peas are an excellent choice. In this article, we’ll be breaking down growing sweet peas indoors and providing you with all the information you need to start growing these wonderful plants today.

Containers and Planting

The first step is to select the variety of sweet pea you’ll be growing. While you can grow most kinds indoors, it’s best to go with a dwarf or bush variety. These won’t grow as tall as traditional varieties, which make them much easier to grow when you have limited indoor space.

When planting, you’ll want to give at least 6” between plants, so choose an appropriate sized container. Make sure to use a high-quality potting soil that is rich in nutrients to start your plants in.

If you’re starting from seeds, score the shells a bit with a knife. This helps them absorb water, and increase the chance that they’ll germinate. Plant them about ¼” deep into the soil and lightly cover. Water the soil immediately after planting.

If you’re starting in a seed tray, you can transplant the seedlings when they are a few inches tall and have about 3-4 leaves. Once transplanted, water right away to help them adapt to their new home.


Sweet peas need about 6-8 hours of bright light per day for optimal growth. This is one of the biggest issues indoor gardeners will face, and the primary cause of a failed sweet pea crop.

If you’re having trouble hitting this number, especially in winter, use a small grow light to supplement. You’ll likely want to get closer to 10 hours of light per day when using a grow light to account for the differences in artificial vs. natural light.

You also want to rotate your plant every couple of days to give it even lighting. If you don’t, you’ll often see it bending towards the light. This can lead to spindly growth that is more likely to topple, and require extra work in providing support.

Water and Feeding

Keep the soil of your sweet peas moist, and check frequently to prevent it drying out. Sweet peas should be watered every few days, especially early on in their growing season. Check the top inch of soil, and water when dry until the soil is saturated. Once the plant flowers, you can cut back and water a little bit less.

Sweet peas are also heavy feeders, so you’ll want to fertilize them every 3-4 weeks. Use a water soluble fertilizer diluted to half strength for containers to prevent shocking the plants. You can also use a slow-release fertilizer as instructed.


Sweet peas are a climbing plant, so you’ll need to provide some type of support. A small trellis support is the easiest, and will provide the support your plant needs to climb.

You can also use stakes or other supports, but these often require a bit more work to set up. Whichever route you choose, don’t neglect this step. Without proper support your plant will not be able to support itself, and this will hamper its growth as well as how much you can harvest.


Sweet peas are generally ready to harvest about 8-10 weeks after germination. Wait until the pods are a few inches long, and then gently snip them off. You’ll want to do this frequently as the plant will continue to produce edible pods after being harvested. This is also good for healthy growth, so look to harvest these seed pods even if you don’t plant on eating them.

Sweet peas are at their sweetest the earlier you harvest them, and begin to taper down as they sit for longer. In this way, you can slightly alter the flavor to match your preferences. Like corn, sweet peas are best enjoyed as soon as possible after harvesting.

Eventually, parts of the plant will begin to brown and die out. That’s perfectly okay and expected. When this happens, simply prune back the plant, and continue to harvest if able. Once the whole plant dies, you can replant another one in its place and begin the process anew.

Lastly, you can also cut the stems with the flowers if you don’t want anything edible from your plant. The flowers are quite beautiful, and make a great centerpiece. Different varieties bloom different colors, so if your goal is looks find one with blooms that match your style.

Moving Outdoors

Many gardeners will look to start their sweet peas indoors and move them outside for the summer. This gives you a larger harvest as the plant will go through a lot of growth indoors. If this is your goal, look to start planting about 1-2 months before your last frost date.

Once temperatures reach an average of 60-70°F outside you can begin moving your plant outdoors. You’ll want to go through a hardening process where you gradually expose your plant to elements outside before moving them there permanently. Start with a few hours per day, and gradually build up to leaving them outside all day. This is especially important for adjusting to the increased intensity of sunlight your plant will experience outdoors.

Growing Sweet Peas Indoors

Sweet peas are an excellent plant that are both delicious to eat and beautiful to look at. If you can’t decide between a plant for visual purposes, or one that is edible, sweet peas strike a nice balance between the two. Give them a shot, and let us know how it went!

Sweet Peas FAQ

How Long Do Sweet Peas Take To Grow?

Sweet peas will take out 8-10 weeks to grow, but this is heavily dependent on their light and nutrient intake.

Can You Grow Sweet Peas Indoors?

Yes, sweet peas can be grown indoors. For best results, go with a bush variety sweet pea as these tend to be smaller and easier to manage in an indoor space.

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