Hemp
Cannabis sativa
Hemp is originally from central Asia, and has been cultivated throughout history as a source of fiber, seed, oil, and medicine.
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Hollyhock
Alcea rosea
Hollyhocks are old-fashioned cottage garden favorites for their height and cheerful flowers in a wide range of colors. Most require staking to support their heavy stems.
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Honesty
Lunaria annua
Honesty is an old fashioned plant with briliant pink flowers that give way to paper-thin silvery seedpods, hence its many common names.
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Honeysuckle
Lonicera sempervirens
A woody, twining vine, honeysuckle needs some structure to support itself. It blooms nearly all summer and is attractive to hummingbirds and other pollinators. It is well-suited for arbors, pergolas, and fences.
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Hoop Petticoat Daffodil
Narcissus bulbocodium 'Golden Bells'
The Hoop Petticoat is one of the smallest daffodils grown at Mount Vernon and is often crowded towards the front of the border for ease of viewing. It has unique flowers with large bells and slender, petite petals.
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Horseradish
Armoracia rusticana
Horseradish is a large spreading vegetable, used primarily for its pungent roots. It should be given a confined space, as it spreads rapidly if left unchecked.
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Hydrangea
Hydrangea arborescens
This versatile hydrangea tolerates a wide variety of conditions and is ideal for borders or natural areas. It benefits from an annual pruning in late winter to prevent the heavy blooms from flopping.
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Jatropha
Jatropha curcas
This large tropical plant is used for various medicinal and economic purposes. The oil from the nuts is currently being studied as a potential source for biodiesel.
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Jerusalem Artichoke
Helianthus tuberosus
Jerusalem artichoke is a perennial sunflower relative that produces a profusion of bright yellow flowers atop ten foot stalks. It is valued for its edible tubers, which resemble the flavor of water chestnuts.
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Joe Pye Weed
Eutrochium maculatum
This tall plant is crowned with purple-pink flowers in the late summer. It is an American native and tolerates a wide variety of environmental conditions. Its height and bloom time can be controlled by by pruning it back by half when it reaches about two to three feet.
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