I tend to use leaves or grass when available, or a tiny amount of tissue when they're not. (all of which are biodegradable and do not litter the course) Is this against the rules???
Is the string to the target not a windicator?
For me using leaves or the target string to try and get a handle on the wind is all part of the 'game' and adds to the enjoyment of HFT.
Besides, what the wind is doing at the peg isn't necessarily what its doing at the target.