
Sweet peas are a favorite among gardeners, and for good reason - they're easy to grow and produce gorgeous, fragrant blooms. Planting them at the right time is key to a thriving garden.
In regions with mild winters, sweet peas can be planted as early as February. This allows them to get a head start on the growing season and produce flowers in as little as 60 days.
However, if you live in an area with cold winters, it's best to wait until the soil can be worked in the spring. This usually means planting sweet peas in late March or early April.
To give your sweet peas the best chance of success, make sure to choose a location with full sun and well-draining soil.
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When to Plant Sweet Peas
Planting sweet peas at the right time is crucial for a successful harvest. You can buy sweet pea plug plants in spring and plant them in fertile soil beneath a support, such as a wigwam made of bamboo canes.
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For most locations where frosts occur regularly, sweet peas should be planted in very late winter or very early spring as soon as the soil is dry enough to work. This is typically around late January to early March.
In mild winter climates, you can plant sweet peas in the late fall (November) so they can develop and bloom in late winter and early spring. To get the best display, dig a trench and fill it with well-rotted manure or compost 6 weeks before you sow the seeds.
Sweet peas grow best with temperatures between 50-55°F for germination, 35-50°F to put on growth, and 45-68°F for flowering. For most cold-climate growers, you'll want to sow your seeds in containers in late January to early March and transplant those seedlings out in your garden as soon as the soil can be worked.
Sweet peas can be sown direct into the ground in April or May, but it's best to plant them out only once the soil has warmed up. Space sweet pea plugs or pots about 20cm apart, and don't worry about separating individual plants.
Here's a rough guide to help you determine when to plant sweet peas:
Growing Sweet Peas
Plant sweet pea seeds in autumn or spring, when the weather is cooler. This is the ideal time for germination.
The biggest mistake growers make is planting sweet peas too warm, but these flowers actually thrive in cold conditions. In fact, starting seeds on a heat mat can be detrimental to their growth.
To encourage bushy growth, pinch out the tips of the plants when they reach 10cm tall. This will help them spread out and form a fuller plant. Most varieties of sweet peas have tendrils that will self-cling to supports, but some may need to be tied in.
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How to Grow
Sweet peas are a cool-season crop, which means they thrive in temperatures between 40-70°F (4-21°C). This makes them perfect for early spring or late summer planting.
To grow sweet peas, choose a location with full sun and well-draining soil. Sweet peas prefer soil with a pH between 6.0 and 7.0.
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Plant the seeds 1-2 inches deep and 3-4 inches apart in late winter or early spring, about 6-8 weeks before the last frost date. You can also sow them in late summer or early fall for a fall harvest.
Water the soil gently but thoroughly after planting, and keep the soil consistently moist during the first few weeks.
The Biggest Mistake Growers Make
Growing sweet peas can be a bit tricky, but I've learned a thing or two from my own experiences.
The biggest mistake growers make is growing sweet peas too warm. Yes, you read that right - sweet peas actually thrive in cool conditions.
Starting seeds on a heat mat is a bad idea, as sweet peas germinate best in cool conditions. This is a common mistake many beginner flower farmers make.
Waiting until after the last frost to transplant sweet peas is also a mistake, as it's often already too late by then. This can leave your plants struggling to establish themselves before the heat of summer arrives.
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Sweet peas don't just tolerate cold, they actually thrive in it. This means you should give them plenty of time to establish themselves before the heat of summer.
Here are some common mistakes to avoid when growing sweet peas:
- Starting seeds on a heat mat
- Waiting until after the last frost to transplant
- Not giving them enough time to establish before the heat of summer
Preparing the Ground
Plant sweet peas in well-rotted manure or compost to give them a nutrient boost, especially if you're planting in mild winter climates.
In mild winter climates (Zones 8, 9, or 10), dig a trench and fill it with well-rotted manure or compost 6 weeks before sowing the seeds to get the best display.
Don't wait too long to plant in colder climates; sweet peas should be planted in late winter or early spring as soon as the soil is dry enough to work.
Planting Out
Planting out your sweet peas is a crucial step in their growth. Plant out your sweet peas from late May, once all risk of frost has passed.
Before planting, harden off your sweet pea plants by putting them out in the day and returning them to a frost-free place at night. This process helps them adjust to the outdoors.
You can buy sweet pea plug plants in spring, which makes it easier to get started. Plant them in fertile soil beneath a support, such as a wigwam made of bamboo canes.
Most sweet peas will grow to about 2m in height, so make sure you have enough space for them to grow. Water in well until they've put on good growth.
Space sweet pea plugs or pots about 20cm apart - don't worry about separating individual plants.
Auckland
In Auckland, the best time to plant sweet peas is from March to June or you can plant them later in spring.
If you're planting sweet peas in Auckland, you can buy seedlings from garden centres.
In Auckland, you can plant winter sweet peas, which will flower approximately 12 weeks from when you plant them.
Keep in mind that planting sweet peas in Auckland requires a bit of planning ahead, as they need time to mature before flowering.
Birth Flowers for April: Daisies
As we prepare the ground for spring, it's worth noting that daisies are the birth flowers for April. They're a classic choice for any garden, and for good reason - they're easy to grow and require minimal maintenance.
Daisies are technically annuals, but they can drop seeds that can take the next season. This means you'll want to keep an eye on them and collect seeds to replant where you want them.
One thing to keep in mind when planting daisies is that they can get out of control if not properly maintained. To keep them in check, make sure to collect seeds and replant them carefully.
If you're new to gardening, daisies are a great starting point. They're hardy and can thrive in a variety of conditions, making them perfect for beginners.
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