CORVALLIS Since being brought to England from southern Italy in the 17th century, sweet peas have been a staple flower in English gardens. They have successfully transferred to all corners of the globe, including climate-friendly Oregon.
Although the initial sweet peas had tiny blossoms, their aroma was strong and alluring. It would appear that the color and fragrance of sweet pea blossoms, which naturally self-pollinate while in the bud, are there more for the gardener’s enjoyment than for the bees. A colorful hedge can be created in a flowerbed, along a walkway, or in planters with shorter bush or dwarf forms, such as ‘Supersnoop’ sorts. To cover fences and trellises, taller climbing cultivars like “Old Spice Mix” or “Royal Family” can be trained.
Both varieties provide gorgeous cut blooms with a range of hues and a sweet, vintage aroma. However, be advised that if consumed in large quantities, the peas are poisonous and inedible.
In western Oregon and in higher elevation places east of the Cascades, sweet peas thrive best when planted in the early spring. Powdery mildew, a fungal disease that can affect crowded plants or those growing in wet, shaded areas, can affect sweet peas. Pea enation, a mosaic virus that can emerge in the sweltering summer, may potentially affect them. Some kinds are resistant to powdery mildew.
The best approach to prevent these illnesses is to plant sweet peas before mid-March in a sunny, well-drained area with adequate air circulation, and to cover the seedlings from frost.
Prepare a 10-inch-deep trench and fill it halfway with well-rotted manure or compost to ensure success. Finish the trench by adding dirt that has been blended with a little amount of super phosphate, bone meal, a balanced fertilizer like 15-15-15, or another organic fertilizer.
Plant the seeds 2 inches apart, 3/4 to 1 inch deep. If the seeds are soaked for 24 hours right before planting, germination can be speedier and more even. As seedlings break through the dirt, be ready to install traps or flee since slugs can be a problem.
The spacing between seedlings should be 5 or 6 inches. Pinch off the stem tip above the uppermost leaves when the seedlings are around 4 inches tall to encourage the growth of a bushier plant with multiple flowering branches. Mulch the area surrounding the plant’s base to keep the ground cool as it grows.
In order to prevent wasted blooms from setting pods, water as needed. Sweet peas should produce long-lasting, sweet-smelling bouquets all summer long if the spent flowers are removed.
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.
In Oregon, when can peas be planted outside?
The Willamette Valley in western Oregon is where peas are farmed. Production can either be watered or not. The non-irrigated production area is often in the Silverton area of the Cascade foothills. Although peas have historically been grown in western Oregon for canning, today all peas in western Oregon are farmed for freezing due to market demands and processor specifications. Variety used for freezing and canning has some differences. Due to the presence of green in the seed coat, refrigerators are typically a darker green. Uncooked seed can be either wrinkled (frozen) or smooth (canners). Varieties can also be categorized according to sieve size, with small-sieve peas being crucial for freezing and rising in popularity overall. These distinctions are becoming less critical as dual-purpose types arise.
Modified-leaf variants have become available more recently. The mutant afila type is semi-leafless and has tendrils instead of leaflets. Leaves of the stipule are still visible. An open plant structure that promotes good aeration, a better growth habit, higher light penetration, and increased color is made possible by this plant habit. In freezer peas, it is extremely crucial that the color be consistent and vivid. The upright plant habit also increases the efficiency and recovery of the crop.
The accumulated heat unit (AHU) system is used to plan crops for a well-organized harvest. The difference between the base temperature for crop growth and the mean of the daily maximum and minimum air temperatures is how this is defined. Scheduling the production of peas has been successful using the AHU system information, proper early and main season variety selection, and field selection depending on elevation. To obtain a 100 tenderometer maturity in the Willamette Valley, early varieties now in use need 1200 to 1300 heat units, mid-season types 1400 to 1500 heat units, and late varieties 1600 to 1700 heat units. This is based on a base temperature of 40 degrees Fahrenheit.
SOIL AND LAND PREPARATION
To produce a regular pea harvest, it’s critical to select a field with consistent fertility, soil type, slope, and drainage. Silt loams, sandy loams, or clay loams are the greatest types of soil.
Peas require a lot of the available soil moisture, yet both over- and under-irrigating can lower yields. When the soil dries out later in the growing season, peas cultivated in moist soils have thin root systems that are unable to meet the plant’s water needs. In moist soils, root rot is frequently an issue.
Using a soil test, determine the remedial lime and fertilizer requirements. For maximum yields, raise pH to 6.5 or higher.
To ensure a strong seed bed, the ground should be plowed, harrowed, and lightly worked with a cultipacker. It is best if the land is level so that harvesting may be done more effectively. Subsurface compaction must be avoided with caution as it contributes to restricted rooting and aeration and puts roots at risk for a variety of root diseases.
Peas can tolerate chilly soil temperatures but are susceptible to overly wet or flooded conditions, which are typical of early spring plantings in western Oregon. 40 to 85 F, preferable 50 to 75 F, will cause germination.
SCHEDULING PLANTINGS
As soon as the soil can be worked in the spring, plantings can be made. Peas are sown in western Oregon between late February and mid-May. The full planting season may be used to grow enation-resistant cultivars. By April 1, stop using enation-vulnerable varieties (see variety list and Disease Control section).
Heat units are used to plan the processing of peas. Schedules for planting and harvesting are set by the processing company.
Peas for the fresh market and edible pod peas may be scheduled based on heat units and picking needs for specific crops. In general, it will take roughly 70 days to harvest crops planted in April, 60 days in May, and 55 days in June. Between mid-April and early May, plantings should be spaced out by about two weeks, and starting in mid-May, by about one week. Over that time, a plant would be chosen for the location.
SEEDING
For ordinary kinds, there are roughly 2000 pea seeds per lb, whereas tiny seeded variants have 3000 seeds per lb. Seed should be drilled for processing at a consistent depth of 1.5–2 inches into wetness, with 3–6 seeds per foot of row spaced 6–8 inches apart. Aim for plant populations of between 350,000 and 480,000 per acre for standard kinds and tiny seeded variants (these tend to have lower emergence).
Keep field borders free of excessive overlaps and double planting. This can result in unevenly colored peas and inconsistent harvesting. To get the best stands, the new small-seeded cultivars must be planted shallowly. These peas require more rich fields and areas with close-to-surface rainfall since they are less vigorous than the usual varieties.
If the moisture is sufficient and not excessive, a light rolling might be helpful. Heavy rolling or packing is likely to inhibit root development, limit the uptake of fertilizer and root nodulation in peas, and increase the proportion of plants suffering from root rot.
When planting on soils that have not previously been planted with peas, inoculate with the Rhizobium bacterium in a planter box treatment.
According to recent studies, the presence of a hollow heart (or cavitation) in the seed can significantly diminish stand and seedling vigor. Premature combining or swathing of the seed crop is thought to exacerbate this physiological problem. The quality of all seed kinds from all seed sources may be impacted by this condition. By variety and seed source, there can be significant differences in severity. In a 1986 seed sampling research, the impacted seed ranged from 5% to 78% with a mean incidence of 33%, and in a 1985 study, the affected seed ranged from 4% to 75% with a mean incidence of 30%.
How are sugar snap peas grown in Oregon?
Over a lengthy harvest season, robust, short vines yield large crops of juicy-sweet, flat, green, crispy sugar pods. Perfect for stir-frying or eating fresh…
Over a lengthy harvest season, robust, short vines yield large crops of juicy-sweet, flat, green, crispy sugar pods. Perfect for stir-frying or eating right away. (Resistant to common wilt, pea virus, and powdery mildew)
START SEEDS OUTDOORS
Plant peas in full sun in well-worked, healthy soil in the early spring as soon as the soil can be handled. Plant seeds 2 to 3 inches apart, 1 inch deep. Plant seeds in broad bands or rows that are 3 inches wide, spaced 2 feet apart. At the time of planting, provide them 2 1/2 foot vines supports. If necessary, use floating row coverings or netting to protect against scavenging birds. Replant as soon as possible if the initial sowing doesn’t germinate evenly since subsequent seedlings catch up rapidly. About two and a half months before the first anticipated fall frost, sow again for a fall crop.
GROWING NOTES
For support of these heavy bearing vines for simple harvesting, use netting, wire trellis, or short tree branches driven into the ground. Before planting, mix a little amount of wood ashes and bone meal into the soil. Maintain healthy pea vines with weeding, watering, and mulching to retain moisture.
HARVEST AND USE
When pea pods are fully developed but remain flat and full of tiny immature peas, pick them periodically. Snow peas cook very quickly, just long enough for their color to deepen in green, and are wonderful in stir-fries with ginger, soy sauce, and garlic. Alternatively, eat the juicy pods straight off the vine.
When can I plant outside sweet peas?
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.
Sweet peas can be planted in the winter.
You can plant sweet peas as long as your winter days are typically below 23°C. Your climate will, however, have an impact on when you should plant. Early April is the ideal time to plant seeds for summer flowers in chilly places. The customary date for planting sweet peas elsewhere is St. Patrick’s Day on March 17. The blooms will, however, only bloom in the late winter and early spring, so any time between early March and late May is acceptable. Choose between seeds and seedlings. Although seedlings are the simpler alternative, seeds are easier to sow, provide more possibilities, and are also less expensive. At this time of year, your neighborhood garden center ought to have a nice assortment of both seeds and seedlings.
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 withstand how much cold?
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.