What is the white powder that gets on rosemary and how do you get rid of it? I rinsed it off once and it came back. This time I rinsed it off and put the plant outside hoping some full sun would help.
It might be Powdery Mildew - a fungal disease from too much moisture and not enough air circulation. You might get by with just putting it in full sun with lots of air circulating, and water less often... rosemary likes it really pretty dry and lots of sun - it doesn't do well indoors.
If that doesn't clear it up, you could repot it in fresh potting soil, after first rinsing all the dirt off the roots and washing the plant itself down with warm soapy water to kill the fungus - then squirt it with chamomile tea which has antifungal properties.
Good luck!! ~TJ
"You can never get a cup of tea large enough or a book long enough to suit me." -CS Lewis
TJ is right, it sounds like Powdery Mildew. You can make a baking soda spray which will help: 1 gallon water 3 tablespoons baking soda 1 teaspoon dishwashing liquid
Mix and fill a spray bottle with the solution. Spray on affected plants once a week.
You may need to trim out any badly infested areas. Good air circulation should help, though I've had them get Powdery Mildew in humid weather anyway. The baking soda spray usually clears it up, though. Blessings, Catherine :)
Rosemary
Posted - Jun 09 2010 : 06:57:47 AM
