Why are peas hard to photograph? Give it a try ... follow the advise of John Lennon and give peas a chance. One of my favourite wild plant photos is, in fact, a Beach pea taken near the waterfront just west of the mouth of Highland Creek. The salmon colour and thin petals allow back light to penetrate creating a very soft effect. You'll need to close down your lens as much as possible to stretch your depth-of-field. Also, under-expose a bit (2/3 stop) and then process with whatever software you are using. Alternatively, you could resist the temptation to close your iris and accept a shallow D of F and concentrate on just a couple of petals, perhaps capturing a fairy-halo effect on the edges. I better not offer any further advise otherwise I might be in danger of believing that I know what I'm doing.