5 Best Vegetables to Grow

Vegetables are divided into two groups: cool-season crops and warm-season crops.

Let’s start off with the cool season crops. Common cool-season vegetables like: 

  • Lettuce
  • Broccoli
  • Peas
  • Carrots
  • Spinach 

All are great choices for cold frame greenhouses and growing in unheated greenhouses.


Growing lettuce is a cost-effective way to serve fresh salad on your table. What’s more, lettuces come in a wide variety of colours, flavours, and textures. So no matter what you prefer – take your salad to the next level!

This cool-season crop grows well in cold (duh), moist weather conditions. Sow seeds thinly, 13mm (½ in) deep, 30cm (1ft) apart in rows. When to sow depends on when you want to harvest.

For summer/autumn cropping, you can sow lettuce from late March to late July. For an earlier crop, sow in early February in seed trays then plant out in early March under cloches or plastic tunnels. 

Early August is the ideal time for early winter cropping. September and October, on the other hand, are perfect months for spring cropping. 

Top tip: To ensure continuity of cropping, sow a short row every fortnight.

broccoli up close with water droplets on it


Good news – growing peas in a greenhouse is relatively simple as they pretty much watch out for themselves! 

Not only peas are effortless to grow, but they’re also a tasty and nutritious legume.

Considered as a cool-season, frost-hardy legume, sugar snap peas are best in salads and mixed with other greens. To start growing them in your greenhouse, sow seeds 1-2 inches deep and 2 inches apart.

Then water the soil carefully with a fine mist until the soil is moist. For climbing, place a 3-foot trellis or plant spiral at the back of the plant. Make sure to do this without damaging the peas.

Lastly, cut off the tips slightly over the leaf node once it reaches 8 inches. This will help stimulate branching and a bunch of carrots


Spinach is a great choice of plant for beginners as it doesn’t require constant high temperatures. 

Its leaves are a great source of vitamins A, B, and C, and they have the highest concentration of iron and calcium among other green leafy vegetables.

Even better, spinach helps to boost your brainpower. This superfood veggie also thrives in the greenhouse and is easy to grow.

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