Dazzling gardeners for well over a century, 'Crystal Palace Gem' is still highly sought after. It was first introduced in 1869 and was named for Joseph Paxton's elaborate glass house designed in 1851 for London's Great Exhibition in Hyde Park. The plant's flamboyant foliage is just as showy, in its own way, as its namesake: round chartreuse leaves with a midgreen center and salmon-red flowers. It provides an altogether eye-popping display that lasts from spring until frost.

Rose-scented leaves and clusters of pale pink flowers adorn this trailing geranium. Grow in a location where the foliage can be touched and, thus, the scent released.

‘Lady Scarborough’ is blessed with strawberry-scented, crinkled-edge leaves and pale pink flowers with dark markings. It works well in a hanging basket if left unpruned.

This trailing plant has peppermint-scented, deeply cut leaves and mauve flowers.

Trailing ‘Roger’s Delight’ has lemon-scented leaves and large red upper petals and paler lower petals.

This plant is a lemon-scented, shrubby, upright pelargonium with pale pink flowers and crinkled leaves.

This lemon-scented, shrubby, upright pelargonium has cream-margined leaves.

This exemplary species has felted, gray, crinkled leaves. Over a long period, it exhibits sprays of butterfly-shaped, rich wine-red flowers, which contrast dramatically with the foliage. Its small stature makes it a perfect candidate for a container or a walkway edge. It has been used medicinally for the treatment of various infections, including bronchitis. It is a native of Africa.