We have some years to go before our first flowering bluebells. They are at the
"grass-like shoots" stage.

http://www.bluebellseeds.com/
"In the first year, in mid-late March, grass-like shoots should appear in the
patch. These are darker green and thinner than normal grass, but may be very
difficult to see in a lawn. In the second year, they are similar, but coarser.
You will not get blooms until the third or fourth year."

Something else they don't tell you on a seed packet.

Each year before they flower I hope that I will be contamination free
for another year. I hate to see our native bluebells tainted by the more
robust Spanish version. Being a Scot I have an affinity with bluebells.
Once again we mass planted them and hope for another blue haze beneath
the trees in the coming weeks. They follow on from the daffodils and
snowdrops. Nature has a fondness for blue and yellow, have you noticed?
I walk my dogs regularly on my local Heath and there the colours are
predominantly purple and yellow.

Bobbie