17 Vegetable Seeds to Sow Outside Before the Last Spring Frost

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7. Spinach

Maximizing your spinach yield starts with planting at the right time. It takes approximately six weeks of cooler weather for spinach seeds to mature into luscious leafy greens. By starting early, you can enjoy your first harvest while your warm-season crops are being planted.

When the soil is ready for planting, sow your spinach seeds at a depth of ½ inch, planting twelve seeds per foot. As your plants grow to 2 inches tall, thin them to 3-4 inches apart. To ensure successful germination, sow your seeds when the soil temperature is around 40°F (4°C).

Spinach thrives in temperatures ranging from 50°F to 70°F (10°C to 21°C). As soon as your seedlings are established, monitor the temperature to ensure optimal growth.

To yield a bountiful harvest, sow additional spinach seeds every two weeks during the spring months. This will allow you to take advantage of the cooler weather and maximize your harvest before the days become too long and hot. With these tips, you can enjoy a plentiful spinach harvest in your garden.

8. Arugula

Experience the bold and tangy flavors of arugula, a leafy green that’s even sweeter when grown in cooler conditions. Arugula seeds are hardy, germinating in soil temperatures as low as 40°F (4°C), and young plants can even survive a light frost.

To grow your own arugula, simply sow the seeds in your garden to a depth of ¼ inch with rows 10 inches apart. Once they start to grow, thin out the seedlings to ensure that each plant is spaced 6 inches apart. With ideal temperatures ranging from 45°F to 60°F (10°C to 18°C), these cool-season greens will thrive and grow rapidly.

After just 6 to 8 weeks, your arugula will be ready to harvest. For a milder taste, pick the younger leaves, or opt for a more pungent and spicy experience by choosing the larger ones. With its versatility and robust flavor profile, arugula is a must-have addition to any kitchen or garden.

4 Weeks Before the Last Frost

9. Mustard

Discover the incredible versatility of the mustard plant, a true all-around provider in your garden. Not only do mustard greens boast a delightful, spicy kick, but they also make a perfect addition to any salad mix. Harvest the leaves frequently throughout the growing season to enjoy their invigorating taste.

Allow your mustard plants to blossom into gorgeous yellow blooms throughout the summer months, while they simultaneously attract beneficial insects and pollinators. These fragrant leaves also work wonders at repelling unwanted garden pests.

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As the flowers begin to bear seeds, you’ll be left with the pungent spice that is commonly used for making mustard. By allowing your mustard plants to bolt, you can guarantee that they will self-seed each year, reducing the need for replanting.

Once the growing season comes to a close, consider turning over your mustard plot to enrich the soil with green manure. As a member of the Brassica family, mustard has the added benefit of being able to get an early start in your garden.

For optimal growth, plant your mustard seeds up to four weeks before the last frost. Space the seeds 4 to 6 inches apart with 2 feet between rows. Trust us, with its many uses and benefits, mustard is a plant that no garden should be without.

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10. Beets

beets – a cold-hardy vegetable that can withstand light frost in spring, making it an excellent choice for early garden planting.

To grow these forgiving crops, direct sow beet seeds into the ground as soon as the soil has thawed, and watch them flourish in near-freezing temperatures. To speed up the germination process, soak the seeds in water for 24 hours before planting. Optimal soil temperatures for planting are 50°F (10°C) and above, but germination can still occur at 41°F (5°C).

When planting, place the seeds ½ inch deep, with 1 to 2 inches of spacing between each seed, and 12 inches of spacing between rows. While waiting for your beet seedlings to emerge, ensure the soil remains evenly moist. Once the seedlings have reached 4 inches tall, thin them to 3 to 4 inches apart.

For a steady supply of fresh beets, plant a new batch of seeds every 2 to 3 weeks until mid-summer. This approach ensures a continuous harvest throughout the growing season. Don’t miss out on this nutritious and delicious root vegetable – add beets to your garden today!

11. Swiss Chard

Swiss chard, a resilient leafy green, is one of the few vegetables that can endure the long, hot summer days. Despite a slower growth rate during hotter temperatures, it quickly recovers and thrives as the weather cools in the fall.

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While Swiss chard can tolerate high temperatures, it is a cool-season vegetable that prefers early planting. The ideal temperature for its growth is 70°F (21°C) and below.

To sow Swiss chard seeds in the garden, wait until the soil temperature reaches at least 50°F (10°C). Plant the seeds half an inch deep, spacing them 2 to 6 inches apart, and leaving 18 inches between rows.

Once the seedlings reach 4 inches in height, thin the plants by spacing them 4 to 6 inches apart for smaller plants or 6 to 12 inches apart for larger ones.

Swiss chard is a cut-and-come-again crop that produces continuously throughout the spring, summer, and fall. To ensure optimal productivity, harvest the outer leaves regularly.

By following these tips, you can grow healthy and productive Swiss chard in your garden.

12. Broccoli

Discover the optimal way to grow and harvest broccoli by following these practical tips. Broccoli, a nutritious cruciferous vegetable, can take approximately 100 days to mature and reach its optimal harvest time. Therefore, it is crucial to allow enough time for the plant to grow before the hot summer months when it may bolt.

For successful broccoli germination, it is advisable to sow the seeds in early spring when the soil temperature is at least 50°F (10°C) or higher, even though they can sprout at 40°F (4°C). Plant the seeds half an inch deep, with 3 inches between each seedling. Once the broccoli seedlings reach three inches tall, thin them out to ensure that there is at least a 12-inch gap between plants. It is also essential to provide sufficient room for growth by keeping the rows approximately 3 feet apart.

The best time to harvest broccoli is when the heads are firm, and just before they start to flower. At this point, the vegetable will be most flavorful and nutrient-dense. In the meantime, while you wait for the broccoli to grow, don’t hesitate to pick some of the leaves for a delicious and nutritious salad green.

By following these guidelines, you can cultivate healthy and thriving broccoli plants in your garden. Remember to give the plant ample space to grow and provide optimal growing conditions for the best harvest results.

2 Weeks Before the Last Frost

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