According to observations of naturalists and beekeepers.
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Hyssop is a perennial plant that is native to the Mediterranean region and has been imported and naturalized in the US and Canada. It grows along roadsides and is sometimes found as a garden herb. Hyssop is quite similar in appearance to other members of the mint family. Its volatile oil possesses a highly aromatic camphor-like smell.
It should be noted that there are a number of other common plants found in North America that go by a variation of the name "hyssop." These include giant hyssop (Agastache sp.), hedge hyssop (Gratiola officinalis), and water hyssop (Bacopa sp.). None of these plants are members of the genus Hyssopus.
This plant is present in at least 17 states/provinces in this country.
Hyssop is a brightly colored shrub or subshrub that ranges from 30 to 60 cm (12 to 24 in) in height. The stem is woody at the base, from which grows a number of upright branches. Its leaves are lanceolate, dark green, and from 2 to 2.5 cm (0.79 to 0.98 in) long.
During the summer, hyssop produces pink, blue, or, more rarely, white fragrant flowers. These give rise to small oblong achenes.
The plant blooms from July to September. The fruits ripen in August.
The plant is commonly used by beekeepers to produce nectar from which Western Honey Bees make a rich and aromatic honey.
Acer saccharinum (aka: Silver maple, Soft maple)
Aronia arbutifolia (aka: Red chokeberry)
Salix discolor (aka: Pussy willow, American pussy willow, Glaucous willow, Large pussy willow)
Salix nigra (aka: Black willow, Swamp willow, Southwestern black willow, Gulf black willow, Scythe-leaved willow)
Pyrus communis (aka: European pear, Common pear)
Acer negundo (aka: Boxelder, Western boxelder, Arizona boxelder, California boxelder, Texas boxelder, Interior boxelder, Violet boxelder)
Populus tremuloides (aka: Quaking aspen, Trembling aspen, Aspen, American aspen, Mountain aspen, Golden aspen, Trembling poplar, White poplar, Popple, Alamo Blanco)
Salix lucida (aka: Shining willow, Greenleaf willow, Tail-leaf willow, Whiplash willow, Pacific willow, Lance-leaf willow, Longleaf willow, Red willow, Western shining willow)
Vaccinium angustifolium (aka: Lowbush blueberry, Early low-bush blueberry, Low sweet blueberry)
Prunus cerasus (aka: Sour cherry, Tart cherry, Dwarf cherry, Montmorency cherry)
Prunus pumila (aka: Sandcherry, Western sandcherry, Eastern sandcherry, Great Lakes sandcherry)
Salix bebbiana (aka: Bebb willow, Beak willow, Beaked willow, Long-beaked willow, Diamond willow, Chaton, Petit Minou, Smooth Bebb willow)
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Prunus americana (aka: American plum, Goose plum, River plum, Wild plum)
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Acer platanoides (aka: Norway maple)
Acer saccharum (aka: Sugar maple, Rock maple, Hard maple)