Started Blue Lake Beans from seed under grow lights this year. Obviously did not have enough light. Got too leggy. They have since been transplanted to the garden but are still very spindley and keep bending over. Now beans are starting to grow on the plants making them even more top heavy. Have trimmed as many of the upper limbs back as I thought prudent. The stems just don't seem to be thickening much and are still weak. Any suggestions? Thanks.