Separating the Bulbs of a Spider Lilly? We have newly planted some Spider Lilly's into two garden beds. ...

We have newly planted some Spider Lilly's into two garden beds. When we be at the nursery, all of their Spider Lilly's (potted) be clumped together which looked really full and effective. Now that we've planted ours at home, they are spaced something like 30cm apart (10 plants in straight string in respectively garden). The garden beds are probably give or take a few 1 metre wide. The gardener said that the plants we bought are close to full size. Trouble is, the garden bed still looks rather thin and incomplete, similar to it needs more plants surrounded by there to hold that full look that we were hoping for.

When we be at the nursery the gardener mentioned something about separating the bulbs and replanting them. At the time we be just similar to, "yeah yeah yeah" but now we are wondering how this is truly done? Do you just verbs the plant apart, breaking the roots or is there more of "art" to it?? Should we do this, or a short time ago buy another 20 plants and fill the garden up? Obviously we know enormously little about plants :)
Answers:    only just gently 'tease' the bulbs apart. For the first year I would give up your job a clump of 4 bulbs. Do this every other year and you'll end up beside loads of them. Don't worry something like them, they're tough little so and so's.
The plants should of had bulbs clumped toghther within the pot. Gently seperate the bulbs apart and plant in the ground. Not intricate to do. In a year or two you will need to do this again.