10Pcs Seed Helianthus annuus Sunflower Biji Benih bunga matahari common sunflower seeds 观赏向日葵种子 Ornamental sunflower

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#10Pcs

#Membeli dengan kami boleh campur pelbagai benih di kedai kami untuk dapat free gift benih
Setiap kuantiti ke-9 akan dapat satu free gift
Contohnya : 9 Jenis pembelian benih akan dapat 1 freegift dan 18 kuantiti akan dapat 2 free gift 27 akan dapat 3 freegift dan seterusnya …

The Helianthus annuus Sunflower has an erect rough-hairy stem, reaching typical heights of 3 metres (9.8 ft). The tallest sunflower on record achieved 9.17 metres (30.1 ft).[2] Sunflower leaves are broad, coarsely toothed, rough and mostly alternate. What is often called the “flower” of the sunflower is actually a “flower head” or pseudanthium of numerous small individual five-petaled flowers (“florets”). The outer flowers, which resemble petals, are called ray flowers. Each “petal” consists of a ligule composed of fused petals of an asymmetrical ray flower. They are sexually sterile and may be yellow, red, orange, or other colors. The flowers in the center of the head are called disk flowers. These mature into fruit (sunflower “seeds”). The disk flowers are arranged spirally. Generally, each floret is oriented toward the next by approximately the golden angle, 137.5°, producing a pattern of interconnecting spirals, where the number of left spirals and the number of right spirals are successive Fibonacci numbers. Typically, there are 34 spirals in one direction and 55 in the other; however, in a very large sunflower head there could be 89 in one direction and 144 in the other.[3][4][5] This pattern produces the most efficient packing of seeds mathematically possible within the flower head.