Completely normal, it does so so that the water runs off the leaves and falls in the root zone of the plant.
Ah nature, love it.
Since you are growing outside, in the open air, there is nothing you need to do, your plant will grow strong enough to support its flowers all by itself, it "knows" what to do! Weak sappy branches are usually more of a problem indoors when there isn't enough light strength or air movement, neither of which are lacking outdoors.
Cheers, Organoman.