Updated: June 30, 2023

Tomatoes are a popular vegetable to grow in home gardens due to their delicious taste and versatility in cooking. While you can purchase tomato plants from a nursery, propagating them from seeds or cuttings can be a rewarding and cost-effective way to expand your tomato garden. In this article, we will discuss the right way to propagate tomato plants and provide step-by-step instructions for success.

Why propagate tomato plants?

There are several reasons why you might want to propagate tomato plants rather than buying new ones. Firstly, propagating from seeds allows you to choose from a wider variety of tomato cultivars, including heirloom varieties that may not be readily available in stores. Secondly, propagating from cuttings allows you to create clones of your favorite tomato plants, ensuring consistent quality and characteristics. Finally, propagating your own tomato plants can save you money, as purchasing new plants can add up quickly.

Propagating tomato plants from seeds

Step 1: Gather supplies

To propagate tomato plants from seeds, you will need the following supplies:

  • Tomato seeds
  • Seed starting mix
  • Seed trays or pots
  • Plastic wrap or a seed tray cover
  • Heat mat (optional)
  • Grow lights (optional)

Step 2: Prepare the seed starting mix

Fill your seed trays or pots with seed starting mix, which is a lightweight soilless mix that provides good drainage and aeration for young seedlings. Moisten the mix slightly before planting the seeds.

Step 3: Plant the seeds

Plant two to three tomato seeds per cell or pot, burying them about 1/4 inch deep. Space the seeds evenly and cover them with a thin layer of seed starting mix. Mist the top layer of soil with water to ensure good seed-to-soil contact.

Step 4: Provide optimal conditions for germination

Tomato seeds germinate best in warm temperatures between 70-80°F (21-27°C). If your home is cooler than this, consider using a heat mat to provide bottom heat to the seed trays. Cover the trays with plastic wrap or a seed tray cover to create a humid environment and retain moisture.

Step 5: Care for the seedlings

Once the seeds have germinated and sprouted, remove the plastic wrap or cover and place the trays under grow lights or in a sunny window. Tomato seedlings require at least 12-14 hours of light per day for healthy growth. Keep the soil moist but not waterlogged, and fertilize the seedlings with a diluted liquid fertilizer every 2 weeks.

Step 6: Transplanting

When the tomato seedlings have developed their first true leaves and are about 4-6 inches tall, they are ready to be transplanted into larger pots or directly into the garden. Handle the seedlings gently by their leaves to avoid damaging the tender stems, and plant them at the same depth as they were in their seed trays.

Propagating tomato plants from cuttings

Step 1: Select a healthy tomato plant

Choose a healthy, disease-free tomato plant as your source for cuttings. Look for a plant that has strong stems and vibrant foliage.

Step 2: Take cuttings

Using clean, sharp pruning shears or scissors, take 4-6 inch cuttings from the top of the tomato plant. Make clean cuts just below a leaf node, where new roots are more likely to form. Remove any lower leaves from the cuttings, leaving only a few leaves at the top.

Step 3: Rooting hormone (optional)

While not necessary, using a rooting hormone can increase the chances of successful root formation. Dip the cut end of each cutting into a powdered rooting hormone, tapping off any excess.

Step 4: Plant the cuttings

Fill small pots or trays with a well-draining potting mix. Make holes in the soil with a pencil or your finger and insert the cuttings, burying them about 1-2 inches deep. Firmly press the soil around the cuttings to ensure good contact.

Step 5: Provide optimal conditions for rooting

Place the cuttings in a warm location with bright, indirect light. Keep the soil consistently moist but not waterlogged to encourage root development. You can cover the cuttings with a plastic bag or a plastic dome to create a humid environment and retain moisture.

Step 6: Transplanting

After 3-4 weeks, check for root development by gently tugging on the cuttings. If you feel resistance, it means roots have formed. At this point, the tomato cuttings are ready to be transplanted into larger pots or directly into the garden.

Conclusion

Propagating tomato plants from seeds or cuttings can be an enjoyable and rewarding experience for any gardener. Whether you choose to grow tomatoes from seeds to explore different varieties or propagate cuttings to clone your favorite plants, following these step-by-step instructions will help ensure success. So get started and enjoy an abundant harvest of delicious homegrown tomatoes!