In case you hadn’t noticed, sweet peas, or Lathyrus odoratus, are a resurging trend. They were the most popular cut flower in North America a century ago, but they lost favor as the billion-dollar global floral market was transformed by refrigeration and air travel. We may credit local flower farmers and the growing slow flower movement for introducing sweet pea blossoms to a new generation.
Starting from seed
The majority of specialists now concur that soaking seeds is not necessary. While utilizing toilet paper tubes to start plants is a popular recommendation, the results are unsatisfactory because the tubes deteriorate over the lengthy starting period.
The deepest pots or cells will help maintain strong root production while growing sweet peas indoors since they produce deep roots (which you will see when you transplant). The best options are 5-inch-deep plug trays or 6-inch-deep root trainers.
Starting to create their third set of leaves, seedlings should be pinched to encourage the development of side shoots, which grow thicker and stronger for the creation of cut flowers. This is arguably the most important but least followed phase in growing sweet peas. After a few weeks, the difference in stem strength once the plants are planted in the garden will be noticeable.
As soon as the land can be worked, which is typically in early spring but occasionally as early as late winter, seed can also be placed directly into the ground, just like one might sow edible peas. Even though they may start out slowly, these plants normally catch up to others that began out quickly, blooming frequently just a week or so later.
Conditions and care
Sweet peas favor a sunny location with fertile soil. Just give them their own row in the vegetable garden; don’t overthink it. Keep them well-irrigated because a drought can stunt growth and degrade quality.
Once the maple trees (Acer) start to bloom, but no earlier, hardened sweet pea seedlings should be put outside. They can withstand minor frosts but not severe ones. Where acidic soils are present, adding a small amount of ground lime will assist slightly elevate the pH. Sweet pea plants will be better able to get more nutrients from the soil if the pH is closer to 6.5–7.0.
The secret to sustaining nearly constant flower output is to cut blossoms off. The season can be prolonged by deadheading any spent flowers and, in particular, by removing seedpods. By mid-July, one might easily become overrun by chopped sweet peas.
Gardeners in the Northeast can enjoy sweet peas as cut flowers indoors or outdoors from late June through July in Southern New England and until August in Atlantic Canada and the cooler northern regions with just a little planning in late winter.
Sweet peas blossom in our Massachusetts garden starting at the end of June and peaking shortly after the Fourth of July when it gets hot and muggy. While up north they can last all summer if flowers are deadheaded and any seedpods are removed, our season may conclude on August 1st.
Training methods
Sweet peas can and should be allowed to grow long (8 feet or more) on a structure because they are real vines, but not just any structure will do. The simplest technique is to grow them solely as cut flowers in a row on netting fastened to sturdy poles in the vegetable garden, but if one teaches them to grow on a brush or twig teepee, they can offer a very English touch to a flower border.
Sweet peas shouldn’t be allowed to grow unsupported by anything. If the structure is covered with netting, a trellis or wood obelisk may function. Instead of twining their stems like pole beans do to climb, sweet peas cling to branches or nets with their delicate tendrils.
Growers of sweet peas in England train each plant to have a single stem and just one per bamboo cane (which are called cordons). Because it yields better flowers, this approach is preferred by rivals. along extremely long stems, big and evenly spaced. Some gardeners would find the work involved in doing this to be too monotonous, but I enjoy the task. In my opinion, the effort is worth it because the flowers grow the biggest and some stems can reach a length of 18 inches when using this method.
Flexible cordons can be made by using 24 8-foot-tall planks or 8-foot-tall canes, and then securing chicken wire or flower netting down the rows. Tendrils will cling onto and wrap around surrounding flower buds, distorting them, so the secret is to clip off as many as you can and tie stems to the netting.
Pruning and tendril trimming are not as necessary if training on a twig tower because the leaves and tendrils are much smaller. Limiting stems on plants using either cordon approach ensures the most profuse flowers, but once plants set off in early June, it takes almost daily attention. Avoid the temptation to leave a lot of main stems since better cut blooms may suffer as a result. This is less of an issue in the border if plants are growing on a tower made of brush or twigs since you want plenty of blossoms rather than lengthy stalks for cut flowers.
A structure like a twig tower or brush teepee will be more efficient if you are planting in the flower border. As more plants will help produce a bushier display and have more presence in the garden, seedlings or seeds can be put around the base closer together in this scenario. However, it will come at the expense of large blossoms and long flower stems.
Pest and disease issues
In general, sweet peas have little issues with insects or diseases. In humid climates, powdery mildew can start to affect plants, although usually only toward the end of the growing season. If the initial flower buds turn yellow and disappear early in the season, don’t become alarmed. Usually in early June, this bud drop happens when nighttime temperatures fall too low or if the daytime and nighttime temperature differences are still significant. The rest of the flower buds will open after the temperature difference between day and night begins to lessen.
Sweet peas may bloom all summer in the cooler regions of the Northeast, such as Atlantic Canada and northern New England; but, once the weather gets hot and muggy around late July, most plants in southern New England will start to slow down and stop producing flowers. The majority of seeds that have produced can be saved because they will usually germinate, but one should never eat the seeds because they are hazardous if taken in big quantities.
Canes of bamboo be used to raise sweet peas?
A sweet pea seedling can simply be wrapped with thread for straight upward growth.
Professional growers and show exhibitors typically cultivate sweet peas in cordons that rise straight up, with one plant per bamboo cane. This has the benefit of allowing for appropriate plant spacing, preventing neighboring plants from obstructing one another, and making it simple to check each plant for wasted flowers. Flowers turning to pod is the adversary of cut flower growers. Planting seeds reduces floral output.
I determined that investing in 50 new individual canes and having the space to keep that many canes was out of my league because I only cultivate around 50 plants a year.
My approach was to construct a building that required fewer canes and could hold vertical strings for the plants to be trained up.
The ability to teach the plant upwards is one of the main benefits of string. Although sweet peas are extremely hardy, if handled aggressively, they can bend or even break. It’s difficult to tie stems to canes, but it’s simple to gently wrap a rope around a developing stem.
What kind of support works best for sweet peas?
One of the best plants for cutting, sweet peas (officially known as Lathyrus odoratus) offer tempting colors and aroma for spring and early summer bouquets. The tiny flowers emit a grape-like fragrance into the air and come in a variety of beautiful colors. We enlisted the assistance of Barb Pierson, our nursery manager, to provide some guidance for individuals who have never grown Sweet Peas in a garden or a container pot. Any beginner or green thumb can benefit from a plentiful supply of these lovely flowers thanks to her advice.
Why do people grow Sweet Peas?
Sweet peas are cultivated for their lovely, ruffled blossoms, which come in pastel, blue, and bicolor hues. They make a desirable cut flower because many varieties have fragrant blooms. The cultivation and breeding of sweet peas for both the home grower and the florist industry has a long history.
How do I go about growing Sweet Peas?
Sweet peas can be grown from seed that is treated before sowing or, more conveniently, from a starting plant. At White Flower Farm, we plant three seeds in each pot to create three Sweet Pea vines.
Where do I plant them and when?
In the northern half of the US, sweet peas flourish in the full sun. They can benefit from afternoon shade in the South. They are planted as early as possible in the spring since they prefer mild temperatures and cool roots. Newly planted seedlings will not be harmed by a mild cold. They can be sown in the fall and cultivated through the winter and early spring in highly warm climates. Compost should be added to the soil, and the area should be well-drained for optimal results. Sweet peas can be successfully grown in raised beds.
Do they need any special care while they are growing?
Sweet peas require support to grow and flower because they are climbing plants. Many other kinds of structures, like a trellis, supports made of mesh or wire, or fences, can be used. To sustain the weight of the vines, they require a sturdy framework that is firmly planted in the ground. The vegetation will develop tendrils that encircle the support you offer.
Since they like nutrient-rich soil, adding compost at planting time is advised. Mulching Sweet Peas will keep the roots cool and help them retain moisture as they grow.
Pinch the growth tips by one after the plants have reached a height of around six to encourage branching and the development of extra flowering stems.
What are the most common mistakes that people make with Sweet Peas?
- planting them in the middle of the summer They dislike the heat and won’t blossom as frequently.
- not offering assistance when planting. Once the plants have begun to grow, it is challenging to install your trellis or support.
- Lack of compost or fertilizer will cause weak plants and fewer flowers in poor soil.
- If Sweet Peas are planted too closely together without being thinned out, powdery mildew can grow and crowding lowers bloom production.
Do Sweet Peas produce pods that you can eat like the ones you find in the grocery store?
Despite having the appearance of snap pea pods, the seed pods are not edible. The pods and seeds can be saved in order to grow plants the following year. Remember that the plants that the seeds may grow may not be the same hue as the parent plant.
Will the plants come back again next year?
The plants are typically not winter hardy in most areas. They are replanted with new seed and plants even in warm climates to produce the most flowers and have robust development.
When do they bloom? Are there tips for getting extra blossoms?
Sweet peas will begin to blossom 4 to 6 weeks after they begin to show apparent vining. Whether or not the plants have been pulled back will affect the timing of the bloom. Although pinching may slightly limit growth, it will result in bushier plants with more flowers. In the spring and early summer, sweet peas will grow and bloom more quickly as the days lengthen. Compost or old dry manure can aid to supply nutrients for the growth of huge, many blooms. A fertilizer with a phosphorus to nitrogen ratio greater than one can also increase flower production.
What is the process for cutting the blooms?
Cut the blossoms early in the day to prevent the sun from drying them off. For your vase, select newly opened flowers with the longest stems. Just the side flowering stems of the plant should be clipped; leave the main stem alone.
Why should I get my Sweet Peas from White Flower Farm?
No seed treatment or waiting for germination is necessary because our plants are grown in our greenhouses in the spring and supplied to you at the ideal time for planting in your region. Our sweet peas arrive completely rooted and ready to plant in the ground in 4 pots, each containing 3 seedlings. You can avoid the time and hassle of starting sweet peas from seed by doing this. The quickest method to enjoy these beautiful flowers outdoors and in vases within your house is to purchase and plant our Sweet Pea seedlings.
Can peas scale canes?
All of the climbing plants—climbing beans, peas, mangetout, and sugarsnaps—need support, yet they all reach different heights and climb in distinctive ways. Here is our manual for creating the appropriate supports for each…
As they expand, canes are required to wrap around them. We advise you to create the canes no taller than 6 feet since they will continue to grow, making it simple for you to cut the growing tip off when they reach the top of the canes. Either a wigwam or an a frame can be constructed. Simply gather five or six bamboo canes, arrange them in a circle, and space them 20 cm apart to create a wigwam. The tips are then simply pulled in and secured with sturdy garden twine. Two rows of canes must be planted for an A-frame, with 50 cm separating the two rows and 30 to 40 cm separating each cane. The tops of each pair should then be pulled together and fastened to a long, horizontal cane that runs across the entire row.
You simply need to give a support that is about 2 feet tall because these do not ascend quite as high. Peas develop differently from beans, sending out tendrils that seek out a surface to attach to. The simplest way to construct a support for them is to attach two canes at either end of the row to a length of chicken wire that is two feet tall. Peas will gladly maneuver around these with ease. Again, they must be around 2 feet long, and it is ideal to use sticks that have several forks and knobbly pieces for the peas to cling to if you don’t have access to chicken wire. If you do not have access to chicken wire, you can instead shove twiggy sticks into the ground.
These can readily grow to a height of 5 to 6 feet, if not more, which is higher than garden peas and sugar snaps. Getting them to scramble up chicken wire that is sandwiched between two canes at either end of the row is once more simplest. To stabilize the frame, you might also need to cross one or two horizontal canes. As an alternative, you might construct a bamboo wigwam and wrap garden twine around the canes (it would look amazing because they resemble sweet peas) for something more aesthetically pleasing.