That's a good idea...I just collected them yesterday...I would like to make a forest planting out of them eventually, do you recommend separating them individually or keeping them together?
Both is possible. Planting them separately would be suitable to create a forest style (Yose-ue), keeping them together would be suitable for clump-style (Kabudachi).
It's going to take years to create that forest though but it's good to make photos. After some time you will not remember what they looked like today, and when comparing, it can be surprising to see how things have developed.