Yes, covering your roses with a protective material like burlap or a frost cloth can help prevent damage from frost.
Yes, covering strawberries can help protect them from frost damage.
Broccoli can tolerate light frost, but it may need protection from prolonged exposure to very cold temperatures.
Not cover but try to protect from heavy weight of snow as it can break branches.
Like many plants and shrubs, roses need sun and good soil. Most types need at least 6 hours of sun each day to bloom well, although there are some that can take a little more shade. They also need winter protection in many areas. Here are some tips on that: http://www.oldhouseweb.com/gardening/roses-winter-protection.shtml
Most pot chrysanthemums are not frost hardy and will need protection from freezing temperatures. If you want to overwinter them outdoors, you can provide insulation with mulch or bring them indoors in a protected area.
Geraniums are hardy perennials so are not too fussy except for extremes. If you mean Zonal Pelargoniums they need frost protection.
Bougainvillea plants can survive winter in mild climates, but they may need protection or be brought indoors in colder regions to prevent damage from frost.
Black soil is needed for the growth of roses.
Roses need sugar to keep them looking fresh longer.
The common name for this plant is Elephant's Food or Elephant Bush. If it is still alive after the winter, then feed it and water it as usual. It may need pruning. Next winter, be sure to water it deeply and cover it on nights where frost is expected.
Climbing roses need at least 6 hours of sunlight per day to thrive.
Roses