Q.ferns and gardenias
Can gardenias take any sun? 0k to cover in winter? Can ferns take the acid fertilizer that gardenias like?

An outdoor Gardenia should have a partial sun location.
A Gardenia should be either brought indoors for winter or if grown in zones 8-10 can winter over outdoors.
https://www.gardeningknowhow.com/ornamental/flowers/gardenia/gardenia-plant.htm
Fertilizing outdoor Ferns should occur in early spring. Ferns are sensitive to over fertilizing. Use a slow release fertilizer, 14-14-14. Organic complete fertilizers are good also.
Follow the application directions on the package.
https://www.gardeningknowhow.com/ornamental/foliage/ferns/taking-care-of-outdoor-ferns.htm