Boerne Lake is a deep lake with lots of grass beds and bank space. It can be a very difficult lake to fish by bank. Usually March,September,and October are pretty good months to fish the bank there. Just my two cents. Try to fish the edges of grass beds and look for shallow drop offs. Fishing is way better by boat or kayak.
Side Note: No gas powered motors in use are allowed on the lake. Paddles and trolling motors are OK.