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Hairgrass can be a bit slow to get started, it is best if you trim it down to about 1cm from the substrate after planting to encourage new growth.

It is usually grown emersed and it's emersed growth is a great attractant for algae.

 

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When I was growing hairgrass I found that once it had enough light and iron, it grows really fast.

Here is a pic of my old tank, took a couple of months to get my hairgrass like this:

I planted it by seperating all the pots of hairgrass and using tweezers to insert a few strands at a time placed a few centimetres apart, then trimmed it down.