Yes, BULRUSHES is a Scrabble word!

Letter values in Scrabble US: B 3, U 1, L 1, R 1, U 1, S 1, H 4, E 1, S 1.

Is it a valid word?

BULRUSHES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

tall marsh plant with cylindrical seed heads that explode when mature shedding large quantities of down; its long flat leaves are used for making mats and chair seats; of North America, Europe, Asia and North Africa
tall rush with soft erect or arching stems found in Eurasia, Australia, New Zealand, and common in North America

Also: cat's-tail, reed mace, typha latifolia, common rush, soft rush, juncus effusus.

Not playable in Scrabble US: NAILROD, REEDMACE.