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The New Year can feel like the perfect time to get productive in the garden and get a head start on the growing season. However, January is still very much winter and, in fact, the coldest month in the UK. While you can start preparing for spring, it’s not quite the time for planting and growing just yet.
Ready to get planting but unsure if it’s time? Let’s sort that out together.
When Should I Start My Garden in the UK?
Springtime is when the gardening year kicks in—so in the UK, that’s between March and May. During this period, the weather and soil warm up, a.k.a. the ideal conditions for new growth.
The trick here, though, is not to plant everything all at once. A good rule of thumb is to check the last frost dates in your area. For instance, start with hardy plants like onions or broad beans, and save tender crops, like tomatoes, for later when the risk of frost has passed.
When Can You Plant Seedlings Outside?
Between March and May is usually a good time, as the weather is more suited to young plants. This gives seedlings the chance to grow strong roots and make the most of the summer warmth. Here are a few examples:
- Tomatoes
- Cauliflower
- Broccoli
- Leeks
- Brussels sprouts
- Sweet peppers
- Sunflowers
- Marigolds
- Lavender
- Geraniums
- Petunias
- Cosmos
Another way to tell if a seedling’s ready is by checking how many true leaves it has. Ideally, you want to see at least three or four true leaves before planting. Just so you know, these true leaves will help the plant make energy through photosynthesis, which will keep it going for the rest of its life.
When Can Vegetables Be Planted Outside?
Most vegetables are sown in spring, though some can be planted earlier or later in the year. This is especially true if you’re starting them indoors before moving them to the garden. If you live in a warmer area, you can start planting as early as late winter or early spring.
Here are some common vegetables that do well in the spring:
- Peas
- Carrots
- Radishes
- Lettuce
- Spinach
- Onions
- Broad beans
- Cabbages
- Potatoes
- Beetroot
Can I Grow Indoors First, like in a Greenhouse, Before Direct Sowing?
Absolutely! This technique is quite common in the UK, especially when it’s too chilly outside. The idea is to start seeds indoors, whether on your kitchen’s windowsill, in a potting shed or in a greenhouse.
Herbs, lettuce, and spinach can thrive on a windowsill (ideally south-facing) during winter. Just remember to open the window occasionally for fresh air, but not if it’s too cold, to avoid dampness building up.
If you’re using a potting shed or greenhouse, the temperature should be between 10°C to 20°C (50°F to 68°F), depending on the plants you’re growing. If there’s not enough natural light, think about using grow lights. Also, make sure to open vents or windows for ventilation when needed.
Give these guides a read to learn more:
