I just recently planted some bacopa sp. japan and was wondering how to grow it in a tall bush...I've seen all kinds of tanks with it like this...do they use a trellis of some sort or just manipulate the new growth upward?
I usually just off the top and plant it and leave the bottom where it is. Lighting, ferts and C02 play a big role as well. Read this to get an idea about stem trimming technique. With a newly planted tank, I have experimented and tried somethings with my tank just to see how the plants grow. When they are growing well I trim them. If they aren't. I wait.