Sweet pea seeds should be directly put into the garden in the fall from September through November in mild winter settings where the ground does not freeze in order to develop robust root systems and blossom in the spring. If you are unable to plant your seeds in the fall, start as soon as spring arrives in a well-drained area that provides some afternoon shade.
In regions with difficult winters, plant about a month before the last date of frost after the worst of the weather has passed. If spring arrives early in your region and becomes hot and muggy, mulch seedlings well and place them where vines will have some afternoon shade.
1. Before planting, you could decide to nick your sweet pea seeds. The seed’s outer layer can be broken off by giving it a quick cut with a nail clipper so it can quickly absorb water. This will result in a higher percentage of your seeds germinating and a few days earlier sprouting.
This is how: Between your thumb and forefinger, hold a seed. Clip your seed by holding the clippers at an angle with the other hand so that you can only utilize the tip of the blade. Not taking a chunk out of the seed is your goal; it is to slice through the brown top layer of the seed. Sometimes the nick you caused is barely visible, and other times a bit of the seed coat cracks off revealing the interior seed’s lighter color. Both are true.
2. Since sweet peas require fertile, well-drained soil, add some aged manure or other finished compost to your garden bed before planting. Work the material into the soil and rake the bed to level it out. Make a furrow with a stick or a tool. Make sure your furrow is 1 inch deep since it’s crucial to plant seeds at the correct depth (for sweet peas, this is 1 inch).
3. When planting your seeds, space them 2-3 inches apart in your furrow. You have a better chance of getting a full bed of plants with no gaps if you sow your sweet peas at this spacing. You will thin your seeds later, when they have grown, to the desired spacing.
4. After sowing, fill in your furrow with earth to cover the seeds. You should only transfer enough soil to fill in the trench without building up a mound above the seeds since you want your seeds to be positioned one depth down.
5. Lightly mist the seeds you covered. To stop the water from washing away the soil, use a watering can or hose with an attachment that diffuses the water so that it showers gently like rain.
Tall sweet peas require a sturdy support in order to ascend. Build one now so that it is there when your seedlings are prepared to begin climbing.
6. You must keep birds, snails, and slugs away from your sweet pea seedlings. In order to prevent these typical predators from discovering your sprouts and eating them before you even realize they are up, you should do this as soon as possible after sowing your seed.
Use netting for birds. Using flexible, black plastic irrigation tubing, often known as polytube and sold at most garden centers, we create our own support hoops. It should be cut into lengths that correspond to the width of your garden beds. To create arches over your sweet pea bed, bury the ends of the cut tubing in the ground. These arches should be covered with bird netting, which should be secured at all edges to prevent openings. Before your sweet peas grow large enough to attach themselves to the netting, remove it.
We choose the product Sluggo for snails and slugs because it is safe for use on people, pets, and wildlife.
7. If you started your seeds indoors, the seedlings must be hardened off before being transplanted into your garden. Hardening off is the process of gradually exposing your plants to the elements they will experience outside, with temperature and direct sunlight being the most important factors. If you don’t, your seedlings can have transplant shock once they are planted in the garden.
When your plants have around 3–4 pairs of leaves, you can begin the hardening off procedure. Place your plants outside where they will receive morning sun in full force and afternoon shade. If you don’t have access to such a place, you will need to relocate your plants every day so that they are in the morning sun and out of the afternoon sun. Move them to a location where they will receive direct sun all day after about 3–4 days. You can move them into your garden in a few more days.
8. We advise deadheading to prolong the blooming period of your sweet pea plants. This entails removing wasted flowers before they have an opportunity to use their energy to produce seeds rather than other blossoms. Deadheading is best done right when the bloom has peaked and is just starting to fade. Cut the entire flower stem off at all times.
9. The blossoming on this plant is completely through. When you can see, the plants begin to slow down and eventually stop flowering altogether as the discarded blooms turn into seedpods. Whether you deadhead or not, all sweet pea plants eventually reach the end of their flowering season. However, you can extend the bloom time by removing spent blossoms.
10. The flowers are, of all, the whole idea of cultivating sweet peas. Remember to cut some and bring them inside; they make lovely, sweet-smelling bouquets. Additionally, the plant will produce more blossoms the more you cut!
When can seedlings of sweet peas be planted outside?
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:
when to plant sweet peas
When between October and April, plant sweet pea seeds. Aim for late October or late November or late February or early March for the best outcomes because midwinter temperatures and light conditions aren’t the optimum. In April or May, sweet peas can also be planted directly into the ground. During a moderate period between March and May, sow your sweet pea seeds and plants.
When can sweet peas in the UK be planted?
Planning and planting for displays of summer color and aroma are best done in the spring, yet there is one tiny bloom that provides more than others. The sweet pea, which is indigenous to Sicily, Cyprus, southern Italy, and the Aegean Islands, has become a staple in many British gardens and allotments. A 12 meter tall annual climbing plant, ensuring sure it has the right support is essential to its development!
With the aid of her West Highland Terrier, Hebe, Griselda Kerr, proprietor of the Dower House in Derbyshire, guides us through the planting out procedure.
Because they are climbers, sweet peas need the assistance of a trellis, wigwam, or obelisk to provide their best results.
About Griselda’s garden
Views of Melbourne from a lovely garden By means of walks and steps, the garden’s pool descends sharply to a grass with herbaceous borders and a bank of shrubs. Planting options include bog gardens, glades, shrubbery, grasses, herb and vegetable gardens, rose tunnels, orchards, and miniature woodlands in various intimate or open spaces. Find out more here. Here is Griselda’s list of gardening tasks for the coming season.
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Sweet peas can they withstand frost?
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 I plant them in January?
The world is still a cold and dreary place even if we may have thrown open the doors to usher in the new year with a loud chorus of Auld Lang Syne. The countryside is still barren and the light is still dim and murky.
Despite this, the start of a new year brings with it a strong urge to plant and develop, and patience may be a challenging animal to tame.
But this year, after diving into the amazing world of flowers, I’ve discovered something that can just barely grate that itch, sweet peas.
I’ve discovered that I’ve already contracted the sweet pea bug since sowing my first batch of Lady Salisbury sweet peas in October.
By the time the temperature and light levels began to fall in December, the plants that were sowed in the fall had grown to a height of about 3 inches.
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I feel compelled to learn everything there is to know about anything new I take up. I read a lot about what would be the preferred flower in the gardening world over the winter.
Maybe we can encourage the next generation to appreciate these treasures in a similar manner that craft beer and sherry have experienced a comeback and are currently fashionable? (As I type, I’m caressing my hipster beard!)
An organization that supports these lovely blooms is called the National Sweet Pea Society. I’ve learned that its website is a great place to learn about events, learn about the history of the plant, and get advice on how to cultivate sweet peas.
When choosing the kinds of sweet peas you might like to cultivate on your plot, the website’s amazing collection of blooming sweet peas is a great resource.
However, Graham Rice’s The Sweet Pea Book was my favorite discovery. Over the holiday break, I read this book quickly after purchasing it. I enjoy reading it.
This is a thorough tutorial for someone who is completely new to sweet peas, yet the narrative is easy to follow and doesn’t make you feel like you are reading a textbook.
Even though I haven’t grown sweet peas for a season, I’m delighted about them. On the other hand, there’s something about this flower that makes me ecstatic to grow it on the allotment this year.
I’m especially drawn to the idea of bringing home fresh flowers that I can arrange in a vase as a lovely accoutrement to the homegrown vegetables we’ll be eating.
This month, I’m planting a second batch of sweet peas. More Blue Velvet and Lady Salisbury. By limiting my selection to only two varieties, I want to ease into producing sweet peas. A vase filled with these blooms will make a straightforward yet eye-catching presentation, in my opinion, due to their stunning color contrast.
Sweet peas are relatively simple to handle because of their large, rounded seeds. They remind me of the edible silver balls that are used to garnish cake tops, except that they are neither silver nor edible.
Annual sweet peas can be seeded in the spring. A January seeding allows the plants to form strong roots, show some early growth, and produce larger plants to set out after the frosts, just like an October sowing did.
Sowing seeds in the middle of January does feel terribly weird. But it’s a widespread practice, particularly in Britain. They have an advantage over those that were sowed in the spring because they were sown earlier, and strong, healthy plants will always prevail over fresh seedlings in the battle against those annoying slugs.
I’ve never had much luck with sweet peas, but I’m well aware of the controversy surrounding the pre-sowing method. Should the seed case be “chimped” to promote germination? Is it beneficial to soak or “chit” the seeds before planting them?
The reality is, according to a reliable source, you only need to poke the seed into the ground for it to sprout. To assure greater results, it could be worthwhile to spend a little more time and apply the aforementioned strategies.
I planted the sweet pea seeds in two 5 inch pots in October. I’m planting each sweet pea seed this time using toilet paper tubes because I’ve learned more.
First off, a 2007 piece in The Telegraph said that we Brits were setting the standard for toilet paper usage. The data showed that Britain’s toilet paper consumption, at 110 rolls per person, was 25 times more than that of Ukraine, which had the lowest usage in Europe.
There are a lot of empty cardboard tubes and bottom wiping involved. Recycling is encouraged. However, they make excellent DIY seed pots.
Second, if you start the seeds in a pot, you’ll need to separate each plant from the massive root ball that has grown by the time you’re ready to put the sweet peas outside. No matter how carefully you do it, some root damage will always result.
Of course, such root injury has very little impact. Only the purist in growth would notice, I’m sure. But perhaps when it comes to our blooming, we should strive to be as professional as we can? Thus, root trainers or modules receive the highest grades.
Root trainers are reusable and quite inexpensive to purchase. I would not have any issues with getting a few packs. However, as I’ve already mentioned, we are drowning in cardboard tubes as a result of how much toilet paper we use.
In terms of root protection, cardboard tubes offer the same advantage as commercial root trainers, but they are also biodegradable. As a result, you can plant the sweet peas outside, pot and all.
Shake the tubes as you fill them with seed compost, then firmly push the compost down. Create a hole in the compost, place the seed inside, and then cover with a thin layer of compost to neatly tuck them into bed. After giving them a good soak, place them in a small greenhouse.
As I previously did with the October-sown sweet peas, I’ll pinch out the January-sown plants when they reach a height of about 3 inches.
Doing this is not difficult in any way, as far as I am aware. The first time I did this, I was terrified as well! Simply pinch off the top of the sweet pea seedling above a leaf joint using your finger and thumb.
It’s nice to be outside planting something that will eventually bloom this year. I’ll be patiently looking for the first indications of tiny shoots breaking through. But just now, I’m returning inside to wrap my hands around a steaming mug of tea.
How are you doing? Do you plant sweet peas in January? Please share your planting plans with me as well as any advise or pointers you have. Leave a comment for me below.