When to Plant Tomato Seedlings Outside in the UK

Tomatoes are one of the most popular vegetables (or fruits, depending on who you ask) to grow in gardens across the UK. However, it can sometimes be confusing to know when the best time is to plant tomato seedlings outside. In this article, we'll discuss the ideal time to plant tomato seedlings outside in the UK.

What's the Weather Like?

The UK is known for its unpredictable weather, so it's important to take this into consideration when deciding when to plant your tomato seedlings outside. Tomatoes are a warm-weather crop and don't do well in frost or cold conditions. So, before you even think about planting your seedlings, take a look at the upcoming weather forecast. Ideally, the temperature should be consistently above 10°C (50°F) both during the day and at night before you plant your seedlings outside.

When to Sow Tomato Seeds?

If you're starting with tomato seeds instead of seedlings, it's best to sow them indoors between late February and April, depending on the variety. This will give them enough time to grow and mature before being transplanted outside. Remember to keep them warm and well-watered during the germination process.

Transplanting Your Seedlings

When your tomato seedlings have grown to their third or fourth set of true leaves and the weather is warm enough, it's time to transplant them outdoors. This usually falls between May and June.

Before planting, dig a hole for each seedling and add in some compost and/or manure to nourish the soil. Be sure to space your seedlings at least two feet apart, so they have room to grow. Pat the soil down firmly around the stem of the seedling and water it thoroughly. If you're planting multiple rows of tomatoes, be sure to space the rows at least four feet apart.

Caring for Your Tomato Plants

Once your tomato seedlings have been transplanted outside, it's important to take good care of them to ensure they grow into healthy plants. Here are a few tips:

Water your plants regularly, especially during dry spells or hot weather.

Mulch around the base of your plants to help keep the soil moist and prevent weeds from growing.

Stake or cage your tomato plants to keep them upright and support the weight of the tomatoes as they grow.

Remove any side shoots that appear between the stem and the branches, as these can divert energy away from the main stem.

Conclusion

Planting tomato seedlings outside in the UK requires a bit of planning and attention to the weather. Make sure the temperature is consistently above 10°C (50°F) and that your seedlings have grown to their third or fourth set of true leaves before transplanting them outdoors. Caring for your plants by watering regularly, providing support, and removing side shoots will help ensure a successful tomato harvest.