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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 productively. 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.
The far northern portion on the central interior of the mainland have some of the coldest zones (zones 5, 4, and small area of zone 3) and often have much less consistent range of temperatures in winter due to being more continental, especially further west with higher diurnal temperature variations, and thus the zone map has its limitations in ...
Most outdoor plants in the UK fall within the range H4, −10 to −5 °C (14 to 23 °F) (hardy in the average winter) to H5, −15 to −10 °C (5 to 14 °F) (hardy in a cold winter). Also, the average minimum temperature in the UK is much warmer than the average minimums in much of the northern US, while the average maximums in the northern ...
A honey bee collecting nectar from an apricot flower.. The nectar resource in a given area depends on the kinds of flowering plants present and their blooming periods. Which kinds grow in an area depends on soil texture, soil pH, soil drainage, daily maximum and minimum temperatures, precipitation, extreme minimum winter temperature, and growing degre
The Salinas Valley in California has had severe problems with Verticillium wilt since 1995, most likely due to flooding in the winter of 1995. Many areas in the Salinas and Pajaro Valleys are unable to grow lettuce due to the high levels of Verticillium dahliae in the soil. [ 13 ]
Verbena bonariensis, the purpletop vervain, clustertop vervain, Argentinian vervain, [2] tall verbena or pretty verbena, is a member of the verbena family cultivated as a flowering annual or herbaceous perennial plant.
A winter species that I do not yet have but is on my list is the indigo-blue flowers of Blue Jasmine, common name is Clematis. This is an herbaceous climber, some with bell-shaped, others with ...
In 1857 an American agriculturist John Hancock Klippart, Secretary of the Ohio Board of Agriculture, reported the importance and effect of winter temperature on the germination of wheat. One of the most significant works was by a German plant physiologist Gustav Gassner who made a detailed discussion in his 1918 paper.