Salicylic acid as plant growth hormone?

Answer 1

absolutely,

it's been used for ages as a rooting hormone for cuttings/clones of plants. The old timers used an extract called "willow water". You can take about 1lb of small willow branches and steep them overnight in water, strain it off and away you go.

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In addition to its use as a rooting hormone it also boosts plants' immune system and increases vegetative, root and fruit growth as well as increased fruit weight and size when applied through foliar feeding. However when foliar feeding salicylic acid you have to use a very dilute solution. I find it is best to use uncoated, caffeine-free and sodium-free aspirin rather than willow water since you have more control over the concentration. Concentrations do vary from grower to grower but the average is 1/2 to 3/4 of one 325mg aspirin (~160-250mg), crushed, per gallon of water sprayed in the morning or evening once every 10 days.

Answer 2

Salicylic acid is a plant hormone that helps regulate plant growth and development, especially in response to stressors like pathogens or environmental changes. It plays a role in signaling pathways that activate defenses against these stressors, as well as influencing processes such as seed germination, flowering, and senescence. Overall, salicylic acid is important for plant growth and survival by helping to coordinate responses to various stimuli.