Hello Jennifer , I am going to recommend A USDA brochure to you for reading while I do some research on establishing food plots for your Monarchs .https://www.fs.usda.gov/wildflowers/pollinators/Monarch_Butterfly/habitat/index.shtml#:~:text=Adult%20monarchs%20feed%20on%20the%20nectar%20from%20flowers%2C%20which%20contain,in%20their%20search%20for%20food.  Clicking on the link above will provide much information on Monarchs and their larvae.  I would suggest reading the entire article and I will do some more research into plantings of choice for the adults. The larvae will feed only on milkweed ,  

A Few Bad Milkweeds

Graphic by Royal Mail.

There are a several native and introduced milkweed plants in the genus Cynanchum (swallow-worts) that are also eaten by monarchs. Swallow-worts have similar chemical properties to milkweeds in the genus Asclepias, that fool monarchs into laying eggs on them. Cynanchum species are not suitable food for monarch larvae. Caterpillars fail to develop into pupae when feeding on them.

Many thanks, Dennis.  I look forward to your next reply.

Hello Jennifer , here is some additional information from the OSU Extension. Click on the link below and it will give you some really good information on what flowers and how to plant . It also includes the time of year these will be in bloom to aid the butterfly from spring to fall .chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://hamilton.osu.edu/sites/hamilton/files/imce/butterflygardens.pdf

When you get to the site you will find in the lower right corner a symbol like a magnifying glass with a plus in it. Press this to enlarge the print for easier reading.

As for predators, what the larvae eat make them undesirable as a food source and you should have little trouble with that. As mentioned in the first link I sent, pay attention to the type of milkweed, native is best, as the larvae will not pupate on some varieties