I'm interested in the Jakobsen mugo pine. I'm having difficulty locating it. Also, I'm in zone 8a. The local garden suppliers sell the Pumilo mugo pine. So I'm wondering if I can find the Jakobsen, will it grow in my zone. Everything I can find it says zone 7.
We don't recommend retail sources, but I suggest you ask your local garden nursery if they can order this variety for you, or check Amazon, eBay or Etsy to order online. https://www.gardeningknowhow.com/ornamental/trees/pine/mugo-pine-information.htm
Mugos are around 40 years old and always healthy. They are turning brown quickly with falling needles - less than two weeks. Only about 1/4th of the plants are green. What is most likely cause? Can they be saved? Weather is fluctuating but still below 20 degree nights and more snow on the way. Were fed with Hollytone in the fall. Foundation plants in front of house.
Overly wet conditions could be the problem which could contribute to root rot or fungal disease. Pest infestation is also a possibility. It's hard to tell from the photo. I would contact the local extension service in your area for a definitive diagnosis. Did you by any chance use a salt de-icer that is getting into the ground near them? That could kill them.
https://extension.umd.edu/baltimore-county
https://www.gardeningknowhow.com/ornamental/trees/pine/mugo-pine-information.htm
https://www.gardeningknowhow.com/ornamental/trees/pine/pine-tree-drying-bottom.htm
We were away for 10 days and he noticed it when he opened the drapes this morning. I noticed tonight when I came home from work. The fact that we didn't see that earlier is why I think it just happened. I see these out the window each day, so it is almost as if it happened overnight. Also, we had cold winds up to 70 miles per hour on Sunday and Monday. Today is Wednesday. Could it be wind damage? Can they recover?
I don't think it's wind damage. I suspect water logging, poor aeration for roots, but I don't know your soil and drainage factors.
How can I treat this?
I suspect Diplodia Blight. These articles will help you:
https://www.gardeningknowhow.com/ornamental/trees/pine/diplodia-pine-tip-blight.htm
https://www.gardeningknowhow.com/ornamental/trees/pine/pine-tree-browning.htm
https://www.gardeningknowhow.com/ornamental/trees/pine/pine-tree-drying-bottom.htm
https://www.gardeningknowhow.com/ornamental/trees/pine/mugo-pine-information.htm
Branches laying flat not standing upright. What is wrong?
Research says that these should be pruned every year to keep them bushy and upright. Here's an article on how to prune mugo pine: https://www.gardeningknowhow.com/ornamental/trees/pine/do-mugo-pines-need-pruning.htm
I'm also including a link that will help you check on the growing conditions for your dwarf pine:
https://www.gardeningknowhow.com/ornamental/trees/pine/dwarf-pine-trees.htm
I added compost to to soil and mulched with about 2" of fine bark. Do you think too much or too little water?
Since it is newly planted, try watering it twice a week. It needs well draining soil, though.
https://www.gardeningknowhow.com/ornamental/trees/pine/mugo-pine-information.htm
in the spring I used (garden safe) Fungicide 3. It did promote new growth but the branches are covered in rusted needles. Will those branches regrow with treatment?
Fungicides do best at preventing fungal diseases, not curing it. Your best bet is to prevent any further disease by making sure your plant has good air circulation, plenty of sun, no overhead watering, and cleaning up any needles that drop.
You can prune out the affected branches if it's not extensive.
https://www.gardeningknowhow.com/ornamental/trees/pine/mugo-pine-information.htm