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  2. List of Northern American nectar sources for honey bees

    en.wikipedia.org/wiki/List_of_Northern_American...

    Perennial 8 9 feral major F Selfheal: Prunella vulgaris: Perennial 7 8 no feral minor F Lungwort: Pulmonaria spp. Perennial 5 5 no feral minor F Appalachian mountain mint: Pycnanthemum flexuosum: Perennial 8 10 minor F Azalea: Rhododendron spp. Perennial 6 8 no ornamental minor F Russian sage: Salvia × floriferior: Perennial 7 9 can be ...

  3. List of hardy palms - Wikipedia

    en.wikipedia.org/wiki/List_of_hardy_palms

    Hardy palms are any of the species of palm that are able to withstand brief periods of colder temperatures and even occasional snowfall.A few palms are native to higher elevations of South Asia where true winter conditions occur, while a few others are native to the warmer parts of the temperate zone in southern Europe, and others are native throughout temperate and subtropical locales in the ...

  4. Hardiness zone - Wikipedia

    en.wikipedia.org/wiki/Hardiness_zone

    It has been adapted by and to other countries (such as Canada) in various forms. A plant may be described as "hardy to zone 10": this means that the plant can withstand a minimum temperature of 30 to 40 °F (−1.1 to 4.4 °C). Unless otherwise specified, in American contexts "hardiness zone" or simply "zone" usually refers to the USDA scale.

  5. Crocus - Wikipedia

    en.wikipedia.org/wiki/Crocus

    Not all species are hardy in the upper zones; C. sativus is winter hardy in USDA zones 6 through 8, and C. pulchellus is hardy in zones 5 through 8. [ 92 ] Some are suitable for naturalizing in grass, but mowing off the foliage before it turns yellow produces short lived plants.

  6. Brunnera - Wikipedia

    en.wikipedia.org/wiki/Brunnera

    [2] It is a herbaceous perennial that grows in a Zone 3 to 8. [2] In 2012 Brunnera macrophylla 'Jack Frost' was named perennial plant of the year by the Perennial Plant Association (PPA). [ 4 ] Based on the (USDA) Hardiness zone it is hardy in zones 3 to 8.

  7. Perennial crop - Wikipedia

    en.wikipedia.org/wiki/Perennial_crop

    Erosion control: Because plant materials (stems, crowns, etc.) can remain in place year-round, topsoil erosion due to wind and rainfall/irrigation is reduced [11]; Water-use efficiency: Because these crops tend to be deeper and more fibrously-rooted than their annual counterparts, they are able to hold onto soil moisture more efficiently, [12] while filtering pollutants (e.g. excess nitrogen ...