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Keyword Search Results for:
Rosemary

5 Found

Question: 57-5201
I have had a Rosemary for 3 years. I bring it indoors for the winter. It developed a white powder on the top this winter. How can I get rid of it? Maria, Chicago, IL

Mort's Answer:
Rosemarinus officinalis is subject to powdery mildew in damp areas. Bring the plant outdoors on a day, when the temps go over 55. Spray with Bordeaux Mix according to directions on the label. It may be difficult to acquire Bordeaux. You can add equal amounts of hydrated lime to ionized sulphur or copper sulphate and get the same results. A teaspoon of liquid soap to the gallon can be used, if a second application is needed in 2 weeks. Bring the plant back inside after spraying.

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Question: 142-5201
My Rosemary has white fly. Since I use this plant for cooking, can I spray it with insecticide? Lilliana, Newport, RI

Mort's Answer:
Anything that you put on the leaves will affect the flavor. Spraying with alcohol wouldnąt affect the flavor as much because it will evaporate. Depending on the severity of the infestation, alcohol may not be effective. My best recommendation would be to put the plant outdoors, while the temperature is between 35 and 40 for prolong periods of time. The white fly will seek shelter in other places outdoors and eventually die, when the temperature goes below freezing. There may be some residue from the eggs, so you will have to repeat this migration to the outdoors several times. The Rosemary will probably survive until spring, when you can leave the plant outdoors for the summer. Next fall, I would wait until the 11th hour before bringing the plant back indoors for the winter. Neem oil is not toxic and could be effective but it would affect the flavor.

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Question: 146-5201
I have had a Rosemary for 3 years. I bring it indoors for the winter. It developed a white powder on the top this winter. How can I get rid of it? Maria, Chicago, IL

Mort's Answer:
Rosemarinus officinalis is subject to powdery mildew in damp areas. Bring the plant outdoors on a day, when the temps go over 55. Spray with Bordeaux Mix according to directions on the label. It may be difficult to acquire Bordeaux. You can add equal amounts of hydrated lime to ionized sulphur or copper sulphate and get the same results. A teaspoon of liquid soap to the gallon can be used, if a second application is needed in 2 weeks. Bring the plant back inside after spraying.

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Question: 370-3410
I am moving from Florida to Maryland. I want to take my rosemary with me this spring. Will it be hardy? Lee, Panama, FL

Mort's Answer:
No problem. Try to take extra soil in a bushel basket. This will help acclimate the rosemary to the new environment. You should cover rosemary in the winter in zone 6. Since Rosemarinus offficinalis is native to the Mediterranean, it probably will not grow as fast in Maryland. You need to cover it unless it is on the south side in a very sheltered area. In New England rosemary should be covered in the winter. Both Maryland and southern New England are in zone 6.

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Question: 106-
My rosemary has black tips and root bound. It is in a 12 inch plastic pot and has not been fertilized in a long time. I would like to cut it back. What should I do? Sandy, Warwick, RI

Mort's Answer:
Black tips on any plant are usually a sign of too much nitrogen or too much water. I would cut off all the tips. Since the plant is root bound, you may be adding water too frequently. You need to pull the rosemary out of the pot and shave the roots about an inch back. Be sure to take off any black or brown roots, which could be mushy. Use new sterile potting with a third coarse sand or ground stone to fill the rest of the pot. Do not use beach sand because it is too salty. You should consider a clay pot but it could be too heavy to move outdoors for the summer. In time your rosemary will be well again with this sage advice.

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