Buying Plants....Leaded or not?

[Glank27]

I am about to start buying plants for my 240ltr aquarium. As for stemplants such as Hgrophila Polysperma is it better to buy it leaded underneath so that it will not float up? Or it is easily plantable without lead weight?

 

[YzemaN]

I think the lead weights are only there to keep the plants from floating at the LFS. If you buy them potted they were probably grown emersed and will go through a transition while they grow the submerged leaves. The leaded are most likely grown submerged and will not have to go through the transition.
When planting just plant 2-3 stems at a time a couple of inches deep and at an angle. This should keep them from floating, but might take a bit of practice. When they've reached the top prune back to 2-3 inches.