allelopathy

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Lavender growing on the vine, protects vine bushes against parasites and diseases. Royalty Free Stock Photo

fish fry shoal in biotope aquascape, figure blur, aquatic plant hornwort debris, poor visibility murky water Royalty Free Stock Photo

Fresh dill Anethum graveolens growing on the herb patch. Gardening Royalty Free Stock Photo

Amaranthus retroflexus, true to one of its common names, forms a tumbleweed. It may be native to the Neotropics or Central and Royalty Free Stock Photo

respiration plant biology Royalty Free Stock Photo

chlorophyll research science plants Royalty Free Stock Photo

Fresh herbs, coriander Coriandrum sativum and dill Anethum graveolens growing on the herb patch. Gardening Royalty Free Stock Photo

Green catkins and young red leafs of a walnut tree, isolated on white - Juglans nigra Royalty Free Stock Photo

photosynthesis laboratory plant Royalty Free Stock Photo

chlorophyll laboratory plant Royalty Free Stock Photo

Pink flowers of sheep laurel in Vernon, Connecticut. Royalty Free Stock Photo

Fresh herbs, Coriander Coriandrum sativum and dill Anethum graveolens growing on the herb patch Royalty Free Stock Photo

Sunflowers (Helianthus annuus) are annual plants native to the Americas, that possess a large inflorescence (flowering head). Sunflower stems can grow as high as 3m (10 ft), and the flower head can reach 30 cm (11.8 in) in diameter with large edible seeds. The term sunflower is also used to refer to all plants of the genus Helianthus, many of which are perennial plants.