The family Fabaceae of legumes includes the genus Lathyrus, which includes sweet peas (Lathyrus odoratus). They are indigenous to the Aegean Island, Sicily, and southern Italy. The sweet pea was first mentioned in print in 1695 in writings by Francisco Cupani. Later, he gave the seeds to an Amsterdam medical school botanist who used them to later produce a study on sweet peas that featured the first botanical drawing.
Sweet peas, which were popular in the late Victorian era, were produced and cross-bred by a Scottish nurseryman by the name of Henry Eckford. This aromatic garden climber quickly gained popularity across the country. These affectionate annual climbers are prized for their striking hues, alluring scents, and protracted bloom periods. Although they continue to bloom in cooler climates, people in warmer areas can also enjoy them.
In the northern parts of the United States, sow seeds in the early spring; in the southern parts, sow seeds in the fall. In order to prolong the bloom period of these tiny beauties, shield the fragile blossoms from the ravages of the harsh afternoon sun and mulch the plants to conserve moisture and control soil temperatures.
Many people are curious as to whether sweet peas can be eaten as they belong to the legume family. No! Sweet pea plants in general are harmful. Although you may have heard that pea vine may be eaten (and wow, is it good! ), this is actually referring to the English pea (Pisum sativum), which is a totally unrelated plant to sweet peas. In reality, sweet peas have some toxicity.
Are perennial peas edible?
Although there are no records of toxicity for this plant, several species in this genus have seeds that contain a poisonous amino acid that, if consumed in high numbers, can lead to a serious neurological condition known as “lathyrism” (although tiny amounts are claimed to be nutritious)[65, 76]. There should be extreme caution.
Recently, I’ve started reading about wide crosses. A wide cross can be used to breed two unrelated or just distantly related plants to create an innovative new type of plant. The likelihood of having a live child is, at best, quite slim. Even then, the children might not be able to have children. The goal is a perennial that may be propagated through cuttings or root segments, so all it takes is one success.
Numerous efforts are being made to breed tomatoes with their wild ancestors. The tomato is not toxic or dangerous to humans, unlike many of its wild relatives. It is definitely worth the effort because the wild ancestors might be resistant to specific illnesses or environmental factors. The wide cross results in progeny that may or may not be poisonous or toxic, and these progeny are crossed repeatedly with domestic tomatoes until the poison is eliminated.
Take a pea and a sweet pea, hybridize the two for a few generations, then breed the progeny back to the edible pea.
Since I don’t know if the cross will be effective or not, I haven’t bothered to seek up how I can identify if the toxin is in the pea. That would probably be something to discover early on in the process.
But wouldn’t that be cool? Edible perennial pod peas that are excellent for dry peas. It intrigues me, I think.
Choosing sweet peas and perennial peas
The major consideration is whether or not aroma is crucial to you when deciding between perennial Lathyrus and sweet peas. Decide if you would then like an annual or perennial plant. There are several color choices available as well as climbing and bushier varieties.
Fragrance
Choose sweet peas (Lathyrus odoratus), which are generally very fragrant, if you enjoy a pleasant garden and sweet-smelling flowers for indoor use.
Lord Anson’s blue pea (Lathyrus nervosus), a perennial Lathyus, is an exception to the rule since it does have a perfume.
How long the plant lasts
After setting seed, sweet peas (Lathyrus odoratus) only have a one-year lifespan. However, don’t let this deter you because they are quite simple to grow from seed. Lathyrus latifolius is an example of a perennial species that returns every year, however there are fewer options and they typically lack smell.
Colour
The annual sweet pea (Lathyrus odoratus) has a large variety of blossom colors, including bicolored varieties. However, the perennial varieties do come in some uncommon colors, like yellow and orange.
Habit
The majority of Lathyrus are climbing plants, therefore support them with canes, netting, or allow them to climb over a bank or through a bush. For ground cover and pots, clumping varieties like the spring-flowering Lathyrus vernus and dwarf bushy sweet pea varieties like “Snoopea” and “Bijou Mixed” are excellent choices.
Buying sweet peas and perennial peas
Although many garden centers also sell a few sweet pea seeds in packets, the largest assortment of sweet pea seeds may be acquired from internet seed suppliers. In the spring, several nurseries and garden centers sell pots of germinated sweet pea seedlings that can be divided into individual plants and raised in pots before being planted outside.
There are a few seed specialists who sell perennial Lathyrus seeds, like Lathyrus latifolius, but many gardeners opt to purchase the plants instead. The plant you’re looking for can be found using our Find a Plant tool.
When to plant sweet peas and perennial peas
- Annual sweet peas should be sown either in late January or early April and planted out in April.
- Sow perennial Lathyrus in the spring or the fall.
Where to plant sweet peas and perennial peas
Locate a sunny area where there is room for the plant to grow or to bush out (depending on its habit). Also acceptable is a little light shade, especially for Lathyrus grandiflorus.
How to plant sweet peas and perennial peas
- To avoid cold shock, indoor seedlings should be hardened off for 10–14 days before being transplanted outside.
- Ideally, four weeks before planting, enhance the soil by incorporating a soil conditioner like garden compost or manure.
- Sprinkle general-purpose fertilizer, as directed on the pack, into the area where you plan to plant it, such as Growmore, Vitax Q4, or blood, fish, and bones.
- Before planting, water your plants thoroughly to hydrate the roots.
- Remove pots from larger plants and ease seedlings out of modules or pots while being careful not to snap or crush the stems.
- Plants should be separated by 20–30 cm (8–1 ft).
- Place climbing plants near to their intended support (within 5-7.5cm or 2-3in), with two plants at the foot of each cane if they are climbing a wigwam.
- After planting, water once more to help the soil surrounding the roots settle.
Use garden twine or sweet pea support rings to secure young climbing plant shoots to canes, pea sticks, netting, trellis, or shrub shoots that they will be growing up. Tendrils in contact with supports will naturally start to cling on, but if any are straying or in danger of snapping, keep tying in new shoots.
In dry weather, check on plants in the ground every 3 to 4 days and on those in containers every day because they won’t flower as well if they become too dry. Each time you water, be sure to use enough water to completely moisten the roots.
Apply a high potassium liquid fertilizer, such as tomato feed, once or twice a week on light or infertile soils. This promotes flowering, particularly in annual sweet peas (Lathyrus odoratus).
Pick or remove dead flower heads as frequently as you can once flowering starts. For annual sweet peas (Lathyrus odoratus), which will stop flowering if seedpods are allowed to form, this is especially crucial.
Pinching out
When plants are around 7.5 to 10 cm tall, pinch out the shoot tips of new spring-sown sweet peas for gardening (3-4in). This promotes robust side branching. Autumn-planted seedlings frequently naturally branch.
Cordons
Pick the strongest shoot and keep pinching out all the tendrils and other sideshoots as they grow whether you want to enter your sweet peas in a local show or just want to maximize the size of blossoms for cutting. By using this technique, the plant directs its attention to the blossoms. The term “cordons” is used to describe these single-stemmed plants.
One stem per bamboo cane or tall stake needs to be tied to them on a regular basis. To keep the shoot in place as it grows, you can use twine looped in a figure-eight pattern around the cane and stem. Use sweet pea rings, which are wire loops that wrap around the stem and cane and are lightly squeezed until they hold, to make things simpler.
Cordons have the potential to grow much taller than the typical 2 m (6 1/2 ft) estimated height.
Cutting back
Cut perennial Lathyrus back to the ground in the fall, or better still, wait until February to do it so the dead stems can serve as wintertime cover for wildlife. When flowering is ended at the end of the summer, annual sweet peas can simply be pulled out and composted. This might happen a little bit sooner during hot, dry seasons.
Methods
Sweet peas can be immediately sown into the ground in April, or they can be planted in seed compost pots in the fall or spring. Although it takes more time, pot-sowing is typically more dependable than direct sowing. If you plant in the fall to enhance your chances of getting early blooms, keep seedlings in a coldframe or cold greenhouse over the winter to protect them from growing lanky. Keep the coldframe’s lid elevated unless a strong frost is anticipated. Sweet peas planted in the spring flower in 12–14 weeks.
Sweet pea seeds frequently have a tough outer covering that makes them more challenging to germinate. Place your seeds on a layer of damp vermiculite or kitchen tissue and store them in an airtight container in a warm area. As soon as the seeds swell or start to sprout, plant them. Some gardeners like to soak the seeds overnight instead, but if you don’t plant them right away thereafter, they might rot. With a sharp penknife, chip off a little portion of the hard seed coat to allow moisture to enter and promote germination on recalcitrant seeds that haven’t swelled.
- Individually sow seeds in seed compost-filled rootrainers or 9 cm (3 in) pots. As an alternative, sow five to seven seeds per 13 cm (5 in) pot, spacing them 2-3 cm (3/4-11/4 in) apart.
- Add 1 cm (1/2 in) of vermiculite or compost to the top of the seeds.
- Add water and maintain at around 15C. (59F)
- It is optional to cover the pots with clear polythene or glass to reduce the likelihood that they will dry out, but keep in mind to remove the covering after the seeds have germinated.
- Once they have grown to around 3.5 cm (11/2 in), carefully transplant single seedlings into 9cm (3 in) pots if you have seeded them several to a pot.
- Use your thumb and finger to pinch out (remove) the top of the shoot just above a healthy leaf when the seedlings are 7.5–10cm (3–4in) tall. This will promote side branches, which are always stronger than the core stem that has been removed.
- At least four weeks before planting, remove all weeds from the soil and add a soil enhancer, such as garden compost, manure, or composted bark.
- Only plant seeds as the soil begins to warm, typically around April.
- To create a wigwam, plant any temporary supports, like pea sticks or bamboo canes, in the ground.
- Take out a shallow drill of dirt 2.5 cm (1 in) deep for rows of sweet peas, and plant a seed every 5 to 7.5 cm in it (2-3in)
- Seedlings should eventually be spaced 20–30 cm (8–1 ft) apart to provide the plants enough room to flourish. The extra seedlings may seem like a waste to compost, but unless treated carefully, their roots are typically too damaged to recover.
- Push two seeds into the ground at the base of each cane to a depth of 2.5 cm (1 in) when sowing around a wigwam of canes.
Perennial peas
In the spring or the fall, divide bigger plants. If you want to divide Lathyrus vernus in the spring, wait until after flowering.
Unfortunately, very few of the issues with sweet peas and perennial peas are extremely problematic.
- Powdery mildew, which is brought on by drought or insufficient hydration, results in a grey leaf coating.
What occurs when you consume sweet peas?
An annual climbing plant with winged stems that is grown for its enticing, scented blossoms.
Flowers: The 3 cm wide, highly fragrant flowers, which can be any color from red to white, are grouped in groups of up to four at the terminals of strong stems that extend over the leaves.
Leaves: The leaves are composed of paired, sparsely hairy, ovate to oblong, up to 6 cm long and 3 cm wide leaflets with terminal branching tendrils.
Fruit/Berries: The fruit is a 6 cm long, hairy pod that ripens from green to brown and contains numerous globular, grey-brown to black seeds.
Accidental intake does not cause poisoning, according to the symptoms. But consuming a lot of seed over several weeks or months can cause a paralytic state. Paralysis, a weak and sluggish pulse, trouble breathing, and convulsions are possible symptoms.
Can you eat sweet peas in bloom?
Although sweet peas (Lathyrus odoratus), particularly the blooms and seeds, are poisonous, garden peas (Pisum sativum) such as English peas, edible podded peas, and snow peas are edible.
Do sweet pea peas have any poison?
Sweet pea seeds contain lathyrogens, which are a mildly toxic substance that, if consumed in excessive amounts, can result in a disease known as lathyrus. Lathyrus causes convulsions, difficulty breathing, and paralysis.
Lathyrus sativus, a species that is similar to it and is farmed for both human and animal consumption. Nevertheless, eating too much of this high-protein seed over an extended period of time can result in lathyrism, a disease that can cause paralysis below the knees in adults and brain damage in youngsters. This typically happens after famines, when the seed is frequently the only source of nourishment for protracted periods of time.
Can you eat sweet pea plant peas?
If you routinely harvest sweet pea blossoms, they will continue to bloom, giving you a strong reason to have lovely flowers in your house. Keep in mind that although sweet pea seed pods resemble edible pea pods, they are deadly and should not be consumed.