From 1 to 15 feet depending on type.
Roof top perennial pllants in pots.
Perennial salvias tend to be shrublike ranging from 12 inches to 6 feet tall.
Plastic composite metal and wood pots are all excellent choices for overwintering perennials in containers.
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.
There are perennials for almost any landscape or garden situation.
13 best perennials for containers.
The first thing you could do is nothing.
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.
Flowers grow on spikes in shades of pink red white coral blue and purple.
Sow seeds or plants in early spring in zones 4 to 9.
Flowers grow on spikes in shades of pink red white coral blue and purple.
While most are plain green look for types with a mottling of dark red or white edges for extra interest.
Alchemilla lady s mantle.
Edibles can also be part of a rooftop garden.
Place the plant in the center of a garden bed or at the back of a garden against a fence for tropical height.
In all my years of rooftop gardening i ve never had this be an issue but let s play it safe.
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.
Plant in moist well drained soil.
They can handle the expanding and contrasting soil as the temperatures fluctuate.
It is hardy in zones 4 8 and reaches just 10 inches tall.
In spring before the yucca and bergenia have returned to form pansies and lamium steal the show.
Perennial tickseed self sows enabling it to naturalize with vigor.
It appreciates room to spread out and you may find it needs dividing after a couple of years.
Leave your potted perennial plant where it is outside.
Yarrow achillea millefolium is an herb that grows in full sun in sandy well drained soil.
If there is a spot in the garden that is all green during parts of the season add a pot of flowering perennials there to liven up the space and add visual interest.
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.