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Alternaria spp. plant pathogens are found across the world, affecting a variety of species, including sunflowers. It is a major defoliating pathogen in warm humid climates like India and Africa. [1] Farmers and businesses produce sunflowers (Helianthus spp.) for manufacturing oil, edible seeds, and ornamental flowers displays. There are a ...
Sunflower seeds are generally planted only an inch deep in the ground. When such shallow planting is done in moist and soaked earth or soil, it increases the chances of diseases such as downy mildew. Another major threat to sunflower crops are broomrapes, a family of plants which parasitize the roots of various other plants, including ...
Helianthus agrestis are an annual species that flower in the late summer to early fall months. [5] Helianthus species require a lot of sun to grow. For optimal growth, the plant should get at least 6 hours of full sun a day. [1] Sunflower seeds also contain a toxic substance that will kill all nearby grass. [8]
Alas, most sunflowers are annual flowers, meaning they do not come back each year like perennial flowers. But, there's a few pieces of good news. But, there's a few pieces of good news.
The disk of a sunflower is made up of many little flowers. The ray flowers here are dried In North Carolina A sunflower seed growing. Sunflowers are usually tall annual or perennial plants that in some species can grow to a height of 300 centimetres (120 inches) or more. Each "flower" is actually a disc made up of tiny flowers, to form a larger ...
Commercially important plants in the Heliantheae include sunflower and Jerusalem artichoke. Many garden flowers are also in this group, such as Coreopsis, Cosmos, Echinacea, Rudbeckia, and Zinnia. Some authors separate Coreopsis and Cosmos into the Coreopsideae tribe. [1] In contrast to the benefits brought by the group, some are problematic weeds.
Some of the top flowering host plants are lance leaf coreopsis, swamp sunflower, evening primrose, rudbeckia hirta, Wreath goldenrod, old field goldenrod, wrinkle leaf goldenrod, and calico aster ...
Pecos sunflower is an annual, herbaceous plant. It grows 1–3 meters (3.3–9.8 ft) tall and is branched at the top. The leaves are opposite on the lower part of the stem but alternate at the top, lance-shaped with three prominent veins, and up to 17.5 centimeters (6.9 in) long by 8.5 cm (3.3 in) wide.