If you put a dab of paint on a hair on your head one inch above your scalp and you didn't wash it off...?

Question

...how far from your scalp will the paint be 3 months later? One inch or further?

Yeah, that's what I thought. I find it a bit curious that if you do the same with a tree, the paint will remain in exactly the same spot.

Answer 1

that's because the upward growth in the tree is caused by the apical stem meristem.

Answer 2

Further, of course. Hair grows from below. It grows with a speed of max. 10 Inches a year (usually 7). Have you ever seen a blonde with black hair roots? She did just that: she put paint to her hair which doesn't get washed out, she put it right to the skin, and 3 weeks later the first 1/4 inch of her hairs are the original color.
In three months, the hair will grow by 2 inches, so 2 inches growth + 1 inch starting distance make 3 inches at the end of your experiment.

Answer 3

Assuming that it isn't rubbed off or washed, etc. I guess it would be determined by how fast your hair grows. Mine grows about half an inch a month so I would guess 2 and a half inches from the scalp in three months.