The first thing you could do is nothing.
Roof top perennial pllants in pots.
Alchemilla lady s mantle.
There are over 12 000 different species of ferns that you can grow in your garden and they make an excellent option to grow in a container.
Yarrow achillea millefolium is an herb that grows in full sun in sandy well drained soil.
Flowers grow on spikes in shades of pink red white coral blue and purple.
Ornamental grasses hardy with few maintenance needs and year round structure to boot are a good fit for rooftop gardens and blue fescue festuca glauca can be used in containers in a border or as an edging plant.
Design your container plantings to coordinate with the seasons so you have something in bloom for spring summer and fall.
There are perennials for almost any landscape or garden situation.
In winter when the bergenia has died back stems from yellow and redtwig dogwoods add to the yucca s colorful display.
Sow seeds or plants in early spring in zones 4 to 9.
In all my years of rooftop gardening i ve never had this be an issue but let s play it safe.
In spring before the yucca and bergenia have returned to form pansies and lamium steal the show.
It appreciates room to spread out and you may find it needs dividing after a couple of years.
Perennial plants are those that return year after year in the garden and grow larger every year that goes by.
They are useful as accents or splashes of color in the landscape or can be combined in perennial gardens.
While most are plain green look for types with a mottling of dark red or white edges for extra interest.
Perennial salvias tend to be shrublike ranging from 12 inches to 6 feet tall.
Plant in moist well drained soil.
Perennial tickseed self sows enabling it to naturalize with vigor.
If you re going to grow a few pots of tomatoes you re probably fine but if you want to plant an extensive rooftop garden get an engineer s report to make sure your roof is up to the task.
Plastic composite metal and wood pots are all excellent choices for overwintering perennials in containers.
From 1 to 15 feet depending on type.
Leave your potted perennial plant where it is outside.
13 best perennials for containers.
Place the plant in the center of a garden bed or at the back of a garden against a fence for tropical height.
They can handle the expanding and contrasting soil as the temperatures fluctuate.
One pot four seasons yucca and bergenia are the core plants in this container shining in summer and fall.
Edibles can also be part of a rooftop garden.