Oleanders are available with single or double flowers, in red, pink, lavender, white, salmon and even yellow.

There are cultivars producing double flowers, and some with variegated leaves.

Pink, dark purple, blue, white, and even double flowers were added.

In the last century engravings showed hollyhocks with huge double flowers, all open at once from the top of the stem to the ground!

This particular species is distinguished by its double flowers and rather stiff plant form.

It is the species of trillium that produces double flowers most frequently.

Many cultivars with double flowers or variegated leaves are also available.

The double flowers from Japan are particularly beautiful.

Modern cultivars come in packets with double or single flowers.

Many cultivars and hybrids have been selected for garden use, including selections with double flowers.