Are the purple berries on mondo grass poisonous, and if they are, what are the effects?
They are not poisonous, but probably do not taste very good.
I am trying to 'get rid' of some mondo grass so it will not keep reappearing each year in a particular spot. I have tried tilling the area up, but that hasn't worked.
You could try using a product called Finale. It breaks down easily so that it doesn't remain in the soil. Your best bet, however, may simply be digging it up and then spraying the sprouts that pop up until it is finally eradicated.
Planted dwarf mondo grass around pavers bordering our fountain. They were nice and green when planted but now are yellowing. Could it be the PAVER SAND/PAVER BASE? They're grouped together closely with 1-inch spacing. The area gets shade in morning and sun in afternoon but have kept shade covering them.
I want to plant mondo grass where existing regular lawn grass is already planted. How do I get rid of the grass so it won't come back and destroy the mondo grass?
This article should help with that: https://www.gardeningknowhow.com/plant-problems/weeds/how-to-kill-grass-naturally-kill-unwanted-grass-in-your-yard.htm
When does one plant dwarf mondo grass in Zone 9?
Early spring or early fall is the best time to plant mondo grass.
How do I prepare Black Mondo grass, Canna Lily and Purple Fountain grass for winter in zone 5?
All of these plants need to be dug up and brought in to at least the garage for the winter. They cannot survive the cold where you are, even if mulched. The canna bulbs can be stored. Here is information on that: https://www.gardeningknowhow.com/ornamental/bulbs/canna/storing-canna-bulbs.htm
As for the grasses, you can put them in pots and allow them to go dormant in a cool, dry place. Water them once a month and bring them back out in the spring.
My mondo grass is all brown, looks like is mildewed. What is wrong?
Pruning can take place in late winter to early spring. You can cut the old grass down to make room for the new shoots.
Generally you can cut to about 3 inches in height. You may be seeing new grass growing in.
A slow release balanced fertilizer can help with color on a Mondo Grass, apply in spring and summer.