Grafting tomato plants onto eggplant plants is an uncommon practice, as these two plants belong to different genera (Solanum for tomato and Solanum for eggplant) and may not readily form successful graft unions. However, if you are interested in experimenting with grafting, here is a general method that you can try:

Materials Needed:

  1. Healthy tomato and eggplant seedlings
  2. Sharp grafting knife or razor blade
  3. Rootstock clips or rubber bands
  4. Sterilized growing medium
  5. Grafting wax or tape

Procedure:

  1. Selecting Seedlings:
    • Choose healthy and disease-free tomato and eggplant seedlings of similar size and stem thickness.
  2. Preparing Seedlings:
    • Use a sharp grafting knife or razor blade to make a diagonal cut on both the rootstock (eggplant) and scion (tomato) stems. The cuts should be clean and match each other as closely as possible.
  3. Making the Graft:
    • Use a cleft grafting technique: Make a vertical split (cleft) in the eggplant stem and insert the cut end of the tomato scion into the cleft. Ensure that the cambium layers of both the rootstock and scion are in close contact.
  4. Securing the Graft:
    • Use rootstock clips or rubber bands to hold the tomato scion securely in place within the cleft. Make sure there is good contact between the cut surfaces.
  5. Protecting the Graft:
    • Seal the graft union using grafting wax or tape to prevent desiccation and infection. This helps in promoting successful healing of the graft.
  6. Aftercare:
    • Place the grafted plants in a humid environment for a few days to facilitate healing. A humidity chamber or a plastic cover can be used.
  7. Transplanting:
    • Once the graft has successfully healed (usually within a couple of weeks), transplant the grafted plant into a well-prepared growing medium or soil.

Important Considerations:

  • Grafting tomato onto eggplant may not always be successful due to genetic differences and potential graft incompatibility.
  • Ensure that both the rootstock and scion are healthy and free from diseases.
  • Maintain proper environmental conditions, especially humidity, during the healing period.

Keep in mind that this is an experimental approach, and success is not guaranteed. Grafting plants of the same species or closely related species is generally more successful than grafting across different genera.