I am new to monkey grass. Can I kill all the unwanted stuff with weed killer and keep my monkey grass safe, or do I have to actually weed it all?
Your best bet would be to hand pull as much as you can to keep weed growth to a minimum. However, you could also try sprinkling corn meal in the area, which has a chemical in it that acts as a pre-emergent on plant seeds preventing them from germinating. Sprinkling corn meal will not harm plants but will keep weeds from growing. Another option (though not one I enjoy recommending) is the use of conventional weed killers. Most weed killers will dissipate after a certain period and that period will be noted on the packaging. Ortho Grass-B-Gon will kill weeds but won't harm your monkey grass.
I have monkey grass and it is spreading everywhere. I want to KILL it. How can I do that?
You best bet would be digging up as much of it as you can and then spraying the area or any sprouts that pop up with Roundup until it is finally eradicated.
Temps here are around 0 for 2 months and 10 for 4 months then 25 to 60 for the other 6 months.
Generally, this plant is only hardy to zones 6b, though it has been known to do well in slightly cooler regions. I am not too sure it can take the chilling temps in your climate, however, at least not without adequate protection. If you are looking for a cool-hardy ornamental grass for your region, then this article may have some ideas: http://www.alaskamastergardeners.org/Ornamental_Grasses_in_AK.html
My monkey grass is flat. I divided many clumps last spring and replanted them in the same location. They produced a few purple flowers and look ok other than they are thin and flat. All my neighbors' clumps are upright and healthy. Could I have planted them too deep? Any suggestions?
The following article might help: https://www.gardeningknowhow.com/ornamental/groundcover/monkey-grass/transplant-monkey-grass.htm
More article links follow the above article.
I would leave the foliage alone until mid-March before pruning it back to 3" high. If the crowns are level with the soil line where you transplanted, your plants are probably just reestablishing their root system. (The crown is where the fan, {the green leaves} meets the top of the roots.) If the crowns are over 1/4" below the soilline, the plants may be suffocating from being planted too deeply, and you may need to raise them.
I would wait until active growth resumes in spring to decide if you've really planted too deep. Anytime you divide, the existing leaves no longer have the support of the rest of the clump, and usually flop and look kind of pitiful. New growth should stand up straight.
I transferred monkey grass from front yard garden into the backyard. I had lots of the root on it. They each were large and taking over the front yard garden. Now a month later they have not taken root and are brown. Can I do anything to make them take root?
Perhaps something is restricting the roots and preventing them from taking up water - air pockets in the soil could do this. Flood the area around the plants and gently press down the soil around them to collapse any air pockets that may be present.
Have you watered the transplanted monkey grass thoroughly? That's the only thing I can think might cause it to not become established.
When can liriope be trimmed?
Liriope (similar to monkey grass) is normally cut back in early spring, just as new growth begins. This article will help, as it applies to liriope as well as monkey grass: https://www.gardeningknowhow.com/ornamental/groundcover/monkey-grass/pruning-monkey-grass.htm
I recently noticed that my dog was eating the berries that are growing on my monkey grass. Will they hurt her? She seems to be having lots of stomach problems and I'm wondering if this is this cause.
Though they are not considered to be life threatening, the berries on monkey grass are mildly toxic if eaten in large quantities. With dogs, you may see some stomach upset and diarrhea. For this reason, you may want to keep your dog away from the plant. Generally, when dogs graze on plant material like this, it is a sign that they may not be getting enough fiber in their diet. If the dog should show worsening signs, I recommend seeking help from your veterinarian.