Originally Posted by Azimuth
Can anyone recommend a good bunch plant that can be cut from the top?
Unfortunately, there are none (that I know of) that look ok when topped and just the bottom left. As jart
said, most can
be pruned this way, and this will encourage them to form more side branches, but the more you do it,the harder it becomes to hide the roughly cut tops. Also, at least one, if not most of the side branches will try and head for the light, effectively forming a new vertical stem, so over time it will look horrible!
The only plants that you can get away with top pruning without noticing the impact too much are those with uniform leaves (preferably those that are small to the eye); i.e grasses and as suggested; Vallis, but even vallis will look ugly with straight cut ends that look too artifical.
If you find pruning too much of a chore, then I would suggest either opting for slower growing species of plants, or put the brakes on your whole tank so that growth is slowed enough to manage.