help my rosemary

Hi, I googled your rosemary problem and found this link.  I hope it helps.  They say this is a common problem with rosemary that is kept indoors.  Good Luck!

http://www.gardeningknowhow.com/herb/white-powder-on-rosemary.htm

I feel your pain.  Rosemary is not an automatically easy tender perennial to over winter.  But after attending a fine lecture by a local herb grower, I was able to over winter a rosemary for several years.  It did die though last year, when I absolutely forgot to water it while in its winter room.  I am not sure you can save this rosemary now that it is struggling.

First, a rosemary does not like to be over watered.  And it does not like heat during the winter.  The very best place for a rosemary during over wintering, is in the draftiest room you have, next to a window that is not perfectly sealed.  The draftier the better.  And water only occasionally.

Rosemary loves to be root pruned before coming in for the winter.  Take the rosemary out of the pot, before it gets sick. and root prune the root ball.  You don't need to take off all the soil, just cut the sides of the root ball into about a 1/3 smaller size, repot with fresh potting soil.  Water then place it in a cool room with a drafty window.  Water moderately.  Do not keep it moist, let it dry out slightly before you water it, then forget it for a while until it is dry again.

The soil should be slightly acid.  Adding peat moss to the potting soil will help add some acid.

To "save" your rosemary, you can try to improve your watering of it, by not watering unless it is dry to the touch, then put the pot out in the spring, with the saucer under the pot removed, let the sun and rain work its miracle on it.  But if it does not revive for you, buy another.  Choose a variety that is known to over winter well.  Ask the garden center for a variety recommendation.