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Tanacetum parthenium, known as feverfew, [1] is a flowering plant in the daisy family, Asteraceae. It may be grown as an ornament , and may be identified by its synonyms, Chrysanthemum parthenium and Pyrethrum parthenium .
Warm stratification requires temperatures of 15–20 °C (59–68 °F). In many instances, warm stratification followed by cold stratification requirements can also be met by planting the seeds in summer in a mulched bed for expected germination the following spring. Some seeds may not germinate until the second spring. [citation needed]
It does best in full sun, but does well enough in part shade. It grows in most any well-drained soil from sandy loam to good quality clay. It tolerates hot and cold climates and can be used as a garden plant in many areas. [7] It has a long blooming period of June into September; one of the longer blooming perennials.
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The chilling requirement of a fruit is the minimum period of cold weather after which a fruit-bearing tree will blossom. It is often expressed in chill hours, which can be calculated in different ways, all of which essentially involve adding up the total amount of time in a winter spent at certain temperatures. [1] [2]
Vernalization (from Latin vernus 'of the spring') is the induction of a plant's flowering process by exposure to the prolonged cold of winter, or by an artificial equivalent. After vernalization, plants have acquired the ability to flower, but they may require additional seasonal cues or weeks of growth before they will actually do so.
[citation needed] Some bulbs – such as tulips – need cold winters to bloom, while others – such as freesia – can survive a freezing winter. [citation needed] Many domestic plants are assigned a hardiness zone that specifies the climates in which they can survive. Winter gardens are dependent upon the cultivation of winter-hardy plants.
Parthenium alpinum is a species of flowering plant in the aster family known by the common names alpine feverfew and Wyoming feverfew. It is native to Wyoming, Colorado, and New Mexico in the United States. [1] This is a small, mat-forming, long-lived perennial herb with gray-green, hairy leaves and solitary flower heads.