Purple rhododendron has many varieties for you to choose.
#12 Purple Hibiscus
Purple Hibiscus is also a beautiful flower to grow in your garden an backyard.
#13 Calla Lily
Calla lily is also called as Arum lily. This purple flowering plant is native to Southern Africa.
#14 Pasque Flower
This purple flower has a fuzzy look.
I grow some pansy plants in my garden. They blooms in purple, yellow, white, and violet-blue.
Fuchsia flowers come in colors of pink, purple, red, white, etc. They look pretty in hanging baskets.
#17 Erygnos (Sea Holly)
Each flower is a head-like cluster of small spiny bracts going with the little purple flowers which present an intriguing form.
#18 Morning Glory
Morning glory cannot be missed in this category. It is an excellent tropical climber that provides funnel-shaped blue, white, pink, or purple flowers and can also be trained over fence, pergola or arbor.
Aster is a daisy-like perennial. It blooms in late summer to autumn, making the garden cheerful.
#20 Prairie Gentian
This flower is also called as Lisianthus. It produces five-petaled flowers resemble roses in shape.