what type of plant is this

Question

Its not lemongrass

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Answer 1

It could be any number of ornamental grasses or sedges, some desirable, some not. There is an invasive sedge, Cyperus entrerianus Boeckl, that has a dark base like this one.

Was this planted or did it just pop up? You will be able to tell what it is when it blooms. Then it will be more identifiable.

https://www.gardeningknowhow.com/ornamental/foliage/sedge/growing-sedge-plants.htm

https://www.gardeningknowhow.com/plant-problems/weeds/controlling-sedge-weeds.htm

https://www.gardeningknowhow.com/ornamental/foliage/ornamental-grass/sensational-borders-with-ornamental-grass.htm