Does lantana grows on northern climate of Lake Michigan?
Lantana are a perennial in zones 9 and 10.
In a cold climate they can be grown as an annual or wintered over indoors.
These links will help you.
https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm
https://www.gardeningknowhow.com/ornamental/flowers/lantana/overwintering-lantana-plants.htm
How to force spent blooms on lantana to rebloom during the summer?
You will have to give it a rest period for recovery. Attempting to rebloom something that requires a rest is for temporary ornamental purposes, and usually causes the premature death of a plant. I would advise letting it complete its natural cycle, for the sake of its own life.
Cutting them back can help start the rest period, and give it a boost for the next season, though.
This article will help: https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm
The blooms of my lantana are turning black. What could be causing this?
This could be a fungus disease.
Check the soil moisture levels. Soil should dry out between waterings.
Make sure there is air flow around the plant.
I would prune away the black plant material.
You can treat the plant with Neem Oil as is works both as a pesticide and fungicide.
https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
I have planted about a dozen Lantana plants along my drive way. They look healthly and are flowering. But....today I found the 2nd plant just gone! The plants are new, about 6 to 8" hign, some spreading. I have put in some tall Lantanas and some spreading. This happened about 2 weeks ago and I blamed it on the teenagers next door (guess I owe them an apology). The plant is just gone. When I dug down to see if it was a gofer, there were no tunnels or signs of such. There was still some roots underground, but nothing above ground. No signs of anything. The plants were in between other plants, so why it picked that plant, don't know. A mystery! HELP
It's hard to say what ran off with your plant. I have known many gardeners that use wildlife cameras to discover the critter that is causing damage in the garden.
Good luck!
I notice some info at nursery reads "lantana" is annual. Another lantana is labeled perrenial. Which is it? I have had lantana that beautifully returns every year, so I thought it would be so hardy, and planted extensively at another house with even more sheltered area and not ONE returned. Are some varieties annual and others perrenial? I am stumped. :(
Most plants that we call “annuals” are actually tender perennials that can't survive winters in colder climates.
https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm
Would it harm the dog to eat the lantana flowers?
Your plant has produced seeds.
This article will help you.
https://www.gardeningknowhow.com/ornamental/flowers/lantana/how-to-propagate-lantana.htm