Can I grow more lantana plants by using rooting compound on plant cuttings? Thanks.
While rooting hormone certainly doesn't hurt, it's not always necessary to root plants. Many plant cuttings, such as lantanas, can be successfully rooted without the use of rooting hormones. This is generally a preference thing. If it works best for you, then go for it.
How much can they be pruned?
I would recommend pruning in early spring. This article has more information: https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-pruning.htm
I planted a standard lantana, as last year and they were beautiful. This year they look totally dead, although there are a couple of green shoots on two of them but on the end of one branch.
Lantana do require warm temperatures, so they may be slow to get started in the spring. You could give it a light fertilizer and just have a little patience! Good luck.
Here is a link about growing Lantana.
https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm
I cut my lantana back to about 6 inches last fall. It's April and still no sign of a bloom. Did I cut it back too far?
Lantana can not tolerate any frost. Did your temperatures dip this past Winter?
If your not seeing any sign of life, I suspect your plant may have perished.
I would continue to water and watch, I always give plants a chance!
https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm
I have perennial lantana, so the garden center told me. I planted it last year. When does it start to come back?
Lantana is considered a tender perennial. It will not tolerate any frost. With the below normal temperatures across nearly the entire United States this past winter, it's most likely your plant did not survive.
I always give plants a chance though, so continue to care for it and look for signs of life.
https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm
I planted lantana in our yard last year - camara variety. Is this variety an annual or perennial?
Lantana is considered to be a tender perennial. It is sold as an annual in Northern climates and can be considered a perennial in warmer zones.
It can not tolerate any frost and with the cold that much of the United States experienced this past winter we are hearing of many gardeners losing their Lantana plants.
https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm
My Lantana plants were supposed to be perennials but have not appeared this spring. Is it too early or are they dead? They are in a sunny spot with wood chips.
Lantana is considered a tender perennial meaning it typically doesn't overwinter well in the garden because it's too cold and won't tolerate frost. So, there is a possibility your lantana didn't survive. However, that isn't to say impossible - a harsh winter coupled with a cold spring isn't a great recipe for early spring growth. I would give it some more time.
For more information on the care of lantana plants, please visit the following link:
https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm