I'm interested in planting native Hibiscus moscheutos (aka swamp rose mallow). But my family already has a fairly large Hibiscus syriacus (rose of sharon). Rose of sharon is considered invasive, but my wife very much wants to keep it (it's a little too big for me to 'accidentally' hit with the mower). So at this point I'm stuck with the rose of sharon. Is there any risk associated with planting Hibiscus moscheutos near (within, say, 100 feet) Hibiscus syriacus? I worry about the possibility of hybridization and contributing further to the invasive problem. I understand that hybridization between invasive and native plants can become an issue but I haven't been able to find any information about this pair of plants specifically and don't understand the risks well enough. Just want to make sure I'm being a responsible gardener! Thanks