Well, one thing these plants, or more specifically their flowers, can't survive is the increasing summer heat. Was 117 degrees at my house in Ontario this weekend and pretty much every flower I had developing on my plants has died. Probably 75+ buds. Was going to be a great flush of flowers. If you live in a high heat area like I do, Id suggest finding some way of shading your plants on the hottest days. Doesn't have to be anything permanent, just something to block the peak sunlight. By blocking the sun you can prevent the plants from absorbing the heat generated by the sunlight in ADDITION to the ambient air temperature. Protecting the plants from one or the other should increase the survivability of the flowers. Unfortunately, where my plants grow, I don't have the option of shading, so I just have to grin and bear with what nature gives me.