I'm planning to grow some Pennyroyal and Corsican mint somewhat close to each other anyway, but this seems like it could be an interesting cross. Pennyroyal is more aggressive, hardier, and has bug repellent properties. Corsican has a creeping growth habit, much shorter stems, and a more pleasant scent and appearance. I've never tried to cross two plants together before. Will both plants end up with hybridized seed? Is it just a matter of collecting and growing the seed from either plant and seeing what kinds of plants develop? Would I get hybrids even without intentionally collecting and planting the seed?