What Is This Bush? And How Big Will It Get?

Question

It measures about 9″ “tall”, and 40 ” wide
it was planted last fall

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Answer 1

It appears to be a creeping Juniper. It will spread to the size limited by what cultivar it is. It will be very hard to say, exactly, which one it is, though.

Here is some general information on the plant: https://www.gardeningknowhow.com/ornamental/shrubs/juniper/growing-creeping-junipers.htm