Auxins are plant hormones that regulate cell growth and development.
Auxins are found at the tips of twigs, roots, and buds. Auxins are the reason roots go down and stems go up. Until recently, it was believed that auxins were responsible for restricting buds lower down the stem from developing. We now know that this apical dominance has more to do with sugar consumption.
Many herbicides are actually synthetic plant hormones that force a plant to grow so fast that it dies.
Auxins travel through the stem downward, through the phloem, so gardeners can bend branches into a more horizontal position to reduce auxin levels and stimulate lateral bud growth.
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