The hardy hibiscus is a beautiful plant that produces huge flowers up to 12 inches in diameter. Colors include pure white, bright yellows and oranges, pinks and deep reds. The foliage is also attractive with large, glossy, serrated green leaves on tall, slender stems. The plant grows well in the southern United States from hardiness zone 8 through 10 and can be propagated easily from seeds purchased from seed companies or collected from pods on parent plants.
Cut the disposable cups down to about 3 inches and punch holes in the bottom for drainage. Place fine potting soil into each cup.
Nick the tip of each seed with a knife to remove a little of the seed coat. This will improve the seed's ability to take in water. It is also a good way to identify viable seeds. Look for the white endosperm within each seed.
Plant the hard hibiscus seeds by making a hole in the soil about 1 inch deep. Place one seed in each cup and cover with potting soil.
Water the hardy hibiscus seeds lightly and place each cup in a medium-size, zip-type plastic bag. This will help the seeds stay moist.
Place the containers in the sun to encourage the seeds to germinate. Watch for growth within the next two to three weeks. Mist with water to keep the soil damp but not wet.
Remove the plastic bags after the hardy hibiscus seeds have sprouted. Continue to water regularly.
Transplant seedlings once the plants have grown several inches. Plant them in a 1-gallon container or in fertile, prepared soil in your garden if your area will support it outdoors.
Fertilize your hardy hibiscus plants and water regularly to encourage them to grow and bloom.