growing purple fountain grass from seed
I have 56 plants that I started from seed. They are about a foot tall and green. Also, spindly compared to pictures of mature plants I've seen. When planting, do you put 3 or 4 plants together and do they change color?
Yes, you certainly can place several of your small plants together to form a larger plant.
You can also leave them and continue growing them as you are.
They just need time to grow larger and mature.