red leaf stem

my friend grows blueberry and the leaf stem is red and green strips
why is this, is it normal?

this is normal, usually on the true nodes the stem turns red after it gets a few inches long. unless the stem gets droopy or dark brownish looking your good. it happens on most plants, im not sure why but i know its a pretty common thing. both my plants have redish stems with green lines running down them. dont worry about it

some body told me it was salt build up ?????????

i guess it could be... iv never heard that befor, but im no "expert" so i could b wrong. but almost every single plant iv ever seen had atleast a couple red stems. iv been told its just chemicals put into the stem to make it stronger to hold the weight of the leaf. i kno if they get really dark red it could b low temps or a mag deff. but in my opinion redish stems are nothing to worry about.