The needles in the middle area of some of the sprigs have turned brown and are dying, I think. What to do? The plant is in a wooden planter about 15 inches deep and 12 inches across and in potting soil.
It is most likely overwatering. Rosemary plants like to be in dry soil. This article has more information: https://www.gardeningknowhow.com/edible/herbs/rosemary/watering-rosemary.htm
What type of fertilizer do you use on a rosemary bush and when is the best time to fertilize?
I would not use fertilizer on rosemary (or most herbs). The reason being that fertilizer will cause rapid growth and the plant cannot keep up with producing the chemicals that create the flavor at the same rate as the growth. It results in a less flavorful leaf on the plant which means a poorer quality herb for cooking.
I have two established Rosemary plants planted in ground near pond. I realize after viewing your web site I have watered too, too much. How should I go about trimming back the growth that looks dead. I will turn off drip system to plants for now. Zone is central Arizona.
Rosemary shrubs normally do not respond well to rejuvenation pruning. That being said, be aware that there is a chance you will lose the shrub, which is possible anyway due to the overwatering. This article should help you with that: https://www.gardeningknowhow.com/edible/herbs/rosemary/pruning-rosemary.htm
In the event that the plant does not make it, you may want to take a few cuttings in order to start new plants. This article will help with that: https://www.gardeningknowhow.com/edible/herbs/rosemary/how-to-propagate-a-rosemary-plant.htm
I would like to know what variety of rosemary grows best in Zones 6 and 7. I live in Tulsa, Oklahoma.
Any of the following should be suitable: Arp rosemary (Rosmarinus officinalis ‘Arp’), Dutch Mill rosemary (R. officinalis ‘Dutch Mill’), Madalene Hill rosemary (R. officinalis ‘Madalene Hill’), Nancy Howard rosemary (R. officinalis var. albiflorus ‘Nancy Howard’)
The needles or rosemary is turning brown all over. I have been very careful not to overwater and it has plenty of sunlight.
It is possible the plant has a fungus, or it is also possible that the plant has too little water. This article will help with indoor care: https://www.gardeningknowhow.com/edible/herbs/rosemary/grow-rosemary-indoors.htm
Treat the plant with a fungicide to help with any fungus issues.
I live in Olympia, WA and have a thick, lush little (16") Rosemary plant shaped into a Christmas tree for the holidays. It has been outside on a patio all days except when under freezing. It is now browning from the inside out. This is my 4th attempt to keep this type of plant going and I just cannot seem to let them live. Any suggestions?
These articles should help wtih caring for rosemany plants: https://www.gardeningknowhow.com/edible/herbs/rosemary/growing-rosemary-plants-rosemary-plant-care.htm
https://www.gardeningknowhow.com/edible/herbs/rosemary/watering-rosemary.htm
https://www.gardeningknowhow.com/edible/herbs/rosemary/grow-rosemary-indoors.htm
From what I read abut Rosemary plants, even the hearty Christmas variety: there are no symptoms for death by overwatering. My little (16") tree has been wintering on a 3 sided porch mostly and in the house when temps below freezing. The inside leaves are drying out and dying. Is there any help or is it too late for this lovely little creation? I am in the Pacific Northwest and we just wrapped up a snow and ice storm. We are usually more temperate, but things they are a changing! I mentioned earlier that this is the 4th time I have attempted to maintain this Christmas plant as long as possible. Perhaps it is more like Poinsettia - just for the holiday and pretty much seasonal unless you live in Florida. Right?
The only other thing I can think of other than a watering issue would be a fungus. You could try treating it with a fungicide, like neem oil, to help it recover. If this does not work, you may want to try propagating a new plant from a healthy portion of the tree. This article will help with that: https://www.gardeningknowhow.com/edible/herbs/rosemary/how-to-propagate-a-rosemary-plant.htm