Pennisetum setaceum, Crimson fountain grass or Purple fountain grass is a noxious weed in Nevada. I am wondering if gardeners have any restrictions when they order these plants.
The best way to determine if there are guidelines for invasive plantings in your area is to contact the County Extension Office.
Here is a link to locate the closest office.
I planted multiple sections of red fountain grass in the correct amount of sun and location around the house. All of them ended the season just as they should. As of now, mid April, all of them are still brown and have no sign of coming back. Are they really late bloomers? Or is is possible to kill all 5 of them at the same time?
I believe you are referring to Purple Fountain Grass.
What zone is your garden in?
Purple Fountain Grass are hardy in zones 9 and warmer.
With some additional protection you can have success in zones 7 - 8.
This would explain the loss of all of your ornamental grass plants.
Here is a link to refresh you the care requirements.
When does the purple fountain grass start to come back? I cut mine down and the winter was very mild.
Depends on what zone you're in. If it isn't showing signs of life by now, there's a good chance it may not come back, especially if this is the first winter you've had it (meaning you haven't had it long enough to establish "about" when you should be seeing new growth). This article may help you: https://www.gardeningknowhow.com/ornamental/foliage/purple-fountain-grass/grow-purple-fountain-grass.htm
I have 56 plants that I started from seed. They are about a foot tall and green. Also, spindly compared to pictures of mature plants I've seen. When planting, do you put 3 or 4 plants together and do they change color?
Yes, you certainly can place several of your small plants together to form a larger plant.
You can also leave them and continue growing them as you are.
They just need time to grow larger and mature.
My son accidentally mowed down my purple fountain grass since they are still fairly new and small. With the roots and such still intact, do they have a chance of re-growing through the remainder of this summer?
This may be a wait and see adventure!
Keep an eye on them and water if they are dry.
If you have a tomato cage around the garden, put that around the remaining plant to protect it.
Best of luck.
I planted Fountain Grass along a wooden fence and it grew beautifully to about 2.5-3 feet tall in Central Texas. Now it is drooping over. We have been watering every two days with a drip hose. Is the drooping caused by not enough water in this heat or too much water? We are still in the growing season. What do you suggest to get it to stand up again?
Was this a new planting this spring?
New plants will need a regular watering schedule the first year to establish a good root system.
After they are established they will need occasional water with more during drought.
Pull back the much to check the soil moisture level. Deep waterings are necessary to get roots established.
Is purple fountain grass deer resistant?
The following article does list purple fountain grass as a deer resistant plant, along with many other options:
https://aggie-horticulture.tamu.edu/archives/parsons/publications/deerbest.html