Sweet peas are available in a wide variety of hues and designs. The majority will only reach a height of 5 or 6 feet, while shorter “bush type” variants are ideal for containers. Pick a few different varieties to extend the flowering season. Find types that bloom early (“short-day”) and late by reading the seed packs (“long day). Even though annual sweet peas predominate, perennial sweet peas are also available (Lathyrus latifolia).
Start early
It’s crucial to start sweet peas (Lathyrus odoratus) blossoming early so they can survive the summer heat because they like chilly temperatures. As soon as the soil can be handled in the spring, you can plant them outside. The seeds will likely be alright even though it will likely still be very chilly. Sweet peas can be planted in the south in late fall for late winter or early spring blossom. Consult local cooperative extension to learn about best practices in your community.
Start your peas inside for the longest blooming season possible. Timing is determined by the date of your region’s last frost. Back up the date by four to six weeks once you get it. You should then plant. For instance, you should plant in early to mid-April if your last frost date is May 15. Don’t know when your region last experienced frost? Consult local cooperative extension or a reliable gardener in the area.
spring
- From March to May, you can easily plant your young sweet pea plants outside. Before planting out, sweet pea seeds sown in the winter or autumn need to be potted up into larger containers. Spring-sown seeds can be transplanted from their rootrainers.
summer
- Pick your sweet peas, then put them in indoor vases. Remove the seed pods from your sweet peas to continue deadheading them. You’ll need to harvest and deadhead them frequently when they’re at their height.
When may I plant sweet peas away from the UK?
Sweet peas should be planted in a well-drained but moisture-retentive soil in an open, sunny location. Sweet peas are ideal for container gardening. utilize a compost that is good, peat-free, and has a slow-release fertilizer added in.
How to sow sweet peas
From seeds, sweet peas are simple to grow in the spring or autumn. If you are planting in the fall, make sure you have space for them to grow until spring in a frost-free location.
Sweet pea seeds sprout fairly quickly. However, by nicking the seed coat with a knife and avoiding the “eye” region, you can encourage germination. Either plant seed in trays, root trainers, or 9cm pots (3 to a pot). Place the seed in a cold frame or greenhouse after sowing it in high-quality, peat-free compost.
View Monty Don’s instructional video on how to cultivate sweet peas from seed:
Planting out sweet peas
Once all risk of frost has passed, you can start planting your sweet peas in late May. Put them outside throughout the day and bring them inside at night to harden them off before planting. When young sweet pea plants are around 10 cm tall, pinch out the tips to promote bushy growth.
In the spring, you can purchase sweet pea plug plants. Under a support, such as a wigwam made of bamboo canes, plant them in rich soil. The average sweet pea will reach a height of 2 meters. Until they have a healthy growth, water them well. Don’t worry about separating individual plants; simply space sweet pea plugs or pots about 20 cm apart.
Watch Monty as he demonstrates how to put out store-bought plants while planting sweet peas. Find out the advantages of giving them a nice drink after planting as well as why it is best to plant them out just once the soil has warmed up:
Sweet peas can withstand how much cold?
As annual plants, sweet peas (Lathryus odoratus) complete their whole life cycle in a single growing season. This traditional flower germinates well in cool environments, but if the plants are not covered, frost and freezing temperatures can cause damage to sweet peas. Direct sow sweet peas outdoors in late fall in warmer areas to enhance winter and spring blooms. Young seedlings can survive cold snaps if they are shielded from abnormally low temperatures.
Tip
Sweet peas can withstand a slight frost, but immature seedlings can freeze in temperatures below 25 degrees Fahrenheit. To ensure your cutting garden flowers will endure chilly nights in the early spring, protect sweet peas when low temperatures are anticipated.
Sweet peas can they withstand frost?
I adore annual sweet peas and believe that they are the most alluring and unforgettable garden flowers because of their beautiful scent, ruffled, winged blossoms, and treasure trove of radiant hues. These fluted beauties are excellent for cutting, and a tiny bouquet of them will fill a room with a mouthwatering aroma that makes me think of orange blossoms and honey. Sweet peas’ delicate, alluring scent is one of nature’s best-kept secrets; it has never been artificially imitated and is never overbearing or cloying.
There are now a large number of options available in a wide range of colors, from the most delicate sweet pastels to rich, vivid deep hues, including stripes and bicolors. You have a choice of classic, tall, quickly-growing vining sweet peas, non-climbing, dwarf kinds for beds and borders, and variants that cascade 8 to 10 inches in containers. All will beautify and fill the garden with a divine aroma in the spring and summer.
Sweet pea horticulture has a lengthy and fascinating history. On an island off the coast of Sicily in 1699, Father Cupani, a botanizing monk, was the first to gather sweet peas in the wild. Eckford, an Englishman, started hybridizing and selecting sweet peas in the 19th century, bringing in larger varieties in a wider spectrum of hues. These “grandifloras,” which are now referred to as “old-fashioned” or “heirloom,” were highly praised as cut flowers.
In this time, cultivars that were more suited to American garden conditions were created by American seed producers who were growing sweet pea seeds for export to the English market and for American seed catalogs. The coastal region near Lompoc, California, which is chilly, moderate, and windy, is perfect for growing sweet peas because the climate prevents the usual bee visitors from visiting the blooms, preventing cross-pollination and allowing for the preservation of exceptionally pure seed strains. Today, that region, together with England, New Zealand, and Tasmania, continue to supply a large portion of the world’s sweet pea seed.
You will find growing sweet peas to be quite gratifying if you follow the right guidelines and timing for planting. Sadly, sweet peas have a reputation for being challenging to produce, especially in the Midwest and Southeast. However, after speaking with successful sweet pea gardeners around the nation for many years, I am confident that sweet peas can thrive everywhere in the nation. Their beauty and smell are definitely worth the effort even in the rare places where they are more difficult to grow. Knowing when to plant the seeds and how to take care of sweet peas effectively are crucial.
When To Plant Sweet Pea Seeds
Sweet peas can be planted in the fall and again in the spring in regions with warm winters that experience prolonged rainy winters and cold summers, such as the Pacific Northwest. Sue, a gardener from Seattle and the creator of our website, plants seeds in April or May for “armfuls of blossoms” through September.
Plant seeds as soon as the ground is workable in rich, well-drained soil in locations with temperate winters, such as the mid-Atlantic states, which experience humid summers and early, unexpected summer heat. Don’t wait until you plant other annual flowers like sunflowers or cosmos or until the date of your last frost (sweet peas may withstand minor frosts). Your sweet peas won’t be developed enough to withstand the hot temperatures of early summer. If it doesn’t rain, make sure to water your sweet pea plants because they require constant moisture.
Nancy Hammer, a market gardener in Virginia, starts seeds indoors in jumbo packs or 4 inch pots in late March so that they can be planted outdoors as soon as they have two or three pairs of leaves. This allows her to get a head start on the season and prepare for the unpredictability of spring weather. In early to mid April, she also plants seeds straight in the ground. In this manner, she will be ready with healthy seedlings regardless of whether it is chilly and rainy well into spring or if sudden hot weather arrives.
Both Susan Keating in Maine and Jay Leshinsky in Vermont wait until the spring soil can be easily handled before planting, often in late April through mid May, in locations with extremely harsh winters like New England where the earth freezes hard and heaves. Additionally, they get a head start by starting seeds indoors a month to six weeks in advance and planting them outside as soon as the weather allows through May. In either case, keep in mind that sweet peas are unaffected by late, mild frosts. Sweet peas planted in the ground in northern regions in April and May will blossom fully in late summer and continue to do so virtually until the first frost. If the summers are particularly hot, choose a location where the vines will receive some afternoon shade and water if it doesn’t rain.
Sweet peas are frost hardy in the UK.
According to Gardeners’ World (opens in new tab), sweet peas should be treated like any other non-hardy annual: “Plant your sweet peas outside starting in late May, after all danger of frost has passed. Put them outside throughout the day and bring them inside at night to harden them off before planting.
The most recent edition of Sarah Raven’s podcast (opens in new tab) claims, however, that “Sweet peas are hardy and can go in the garden from the middle of March.”
Confused? So were we up till we learned the RHS’s excellent sweetpea-growing tips (opens in new tab) (watch in the video above). Sweet peas are in fact “extremely tough,” says Propagation Leader Sam Gallivan, and they can withstand frosts “with no issue at all.” They do struggle with extended cold and rainy times, though. Your young sweet pea plants could perish if you reside in a region where early spring can bring both low temperatures just above freezing and a lot of rain.
Because of this, you have two options: either hold off and plant them outside in April when the weather will be warmer, even if it rains, or keep them in a cold frame until the chilly showers stop. However, sweet peas are typically categorized as half-hardy annuals and can withstand dry frost up to -4C. (25F). You will need to cover them with horticultural fleece in the event that temps fall below that.
Sweet peas can they grow in pots?
It’s simple to grow sweet peas in pots! You may have colorful and fragrant sweet peas all summer long with a few easy tips and tricks!
Sweet peas thrive in containers and pots. They only require excellent soil, sunlight, water, and a climbing structure. After that, relax and watch your sweet peas, which have a lovely aroma, develop and prosper.
Easy to grow!
I’m a huge fan of sweet pea flowers. There may not be a flower with a more exquisite aroma, and their petals are so lovely and fragile. Since sweet peas are fortunately fairly simple to grow, I make sure to have a lot of them in my garden during the summer. Actually, you can have blooms well into the fall if you’re fortunate and the weather is nice.
Grow Sweet Peas in Pots!
My yard used to receive a lot of sun when we first moved into our house over 15 years ago, making planting sweet peas relatively simple. I used to plant them in a row along the back fence, but as our trees have grown, the location is now shady and no longer ideal for growing sweet peas. I now cultivate them in containers. I plant sweet peas exclusively in approximately 5 pots since I adore them so much.
Great for limited space!
You do not need acres of land to appreciate a garden, as I have come to realize over the years. You can grow plants if you have a balcony, patio, or small urban yard. Don’t let a lack of room prevent you from growing most plants because they thrive well in pots. In my teeny, small urban yard this summer, I actually planted a cut flower garden, and I loved it SO SO much. I’m going to plant more flowers this year!
Tips for Growing Sweet Peas:
I’ve learned a few things about cultivating sweet peas over the years, so I thought I’d share some advice I’ve received.
Look for dwarf or short kinds that don’t grow much taller than 2 feet. They are also referred to as bush sweet peas.
Actually, this is a matter of taste. As soon as the snow melts in the early spring, many people will sow sweet pea seeds immediately into their gardens, which is a fantastic time because the soil is damp enough to soften the seeds. I will occasionally do this, but I frequently forget to get them out in time, so I will soak the seeds first. This involves giving the seeds a 24-hour soak in water before planting them in the ground. The seed coat will become softer as a result, hastening the sprouting process.
Any pot or container you use should be at least 6 inches deep. The deeper the container, the better because sweet peas like to spread their roots out.
To ensure proper drainage, check the pots and containers you use for your sweet peas. Sweet peas dislike to stay submerged in water.
Use high-quality potting soil since sweet peas prefer rich soil. Compost should also be added to it as an amendment.
obey the directions on the package. However, the fundamental guidelines call for planting them 2 inches apart and 1 centimeter deep. Most of the time, I will sow more seeds than is advised in case some of them don’t germinate. Just thin them out if I get too many.
Because sweet peas like to climb, you should always give them something to do so. Sticks can be inserted into pots when utilizing pots so that when the sweet peas grow, their tendrils can cling to the sticks. In my pots, I simply used twigs; you can see them in the image above. A modest trellis or chicken wire are other options.
As they get higher, your sweet peas will require a little help. You may need to assist the tendrils so they will latch onto the stakes or trellis. I’ll use tiny pieces of thread to delicately attach the stems to the support rods.
Sweet peas thrive best when their roots are firmly planted in cold, wet soil and their blossoms are exposed to the sun. Consider adding some mulch to the pot once the plants have sprouted to maintain the health of their roots.
Sweet peas don’t actually require a lot of fertilization. Contrary to popular belief, sweet peas do not enjoy nitrogen as much as peas do. My sweet pea plants don’t get much fertilizer from me.
Keep your sweet peas well-hydrated without drowning them. They dislike getting too dry or damp.
It’s always so difficult to do this, but as soon as your sweet peas begin to grow, you need to pinch them back to encourage side shoots, which will produce strong, bushy plants. Simply use your fingers to pinch off the stem’s top just above a group of leaves to do this. I know it’s difficult, but your sweet peas will benefit from it.
Eliminate old seedpods and blooms. Doing this frequently promotes new growth, so be sure to do it!
If you’re anything like me, you grow sweet peas in order to harvest the flowers and bring them inside. The scent of them in the summer I just can’t get enough of. The good news is that when you select more blooms, more will grow as a result.
I hope this encourages you to plant sweet peas as well! You can have an abundance of lovely blooms all year long with a little care!