The AHS book "Plant Propagation" (ed. A. Toogood) discusses the historical method of grafting tomatoes by adjacency. Simple, effective approach with no splicing.
But eggplants ... now you have me thinking about graft compatibility with Naranjilla (Solanum quitoense) which flourishes outdoors in the ground here year-round. I think I'll give eggplant-on-naranjilla a try this Spring.
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Richard
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