1 Both moms warned me about the sweet peas and continuously scolded "You've gotta pull these damn things out of your garden before they take over!" but I insisted we at least leave a few and let them bloom. They do have purty flowers at least. I guess they can get crazy-invasive and have these little viney strands that will grab and choke other plants, or maybe cross-breed with them if it suits their fancy (it had previously tried to get it on with the nearby bleeding-heart flowers). One of them grabbed a piece of my hair the other day, so we'll see what freaky hybrid comes of that.