@trh

TIL: > Where do dandelions get the physical material to grow as quickly as large as they do? The material comes almost entirely from air and water — which is genuinely counterintuitive. Carbon (the bulk of all biomass) comes from CO₂ pulled out of the atmosphere through photosynthesis. Glucose is built from it, then converted into cellulose, lignin, proteins, everything structural. A dandelion going from seedling to full rosette is mostly solidified air. Water makes up 80-90% of the fresh mass, so a lot of that apparent “size” is just turgor — cells inflated with water acting as a hydraulic skeleton. Minerals (nitrogen, phosphorus, potassium, etc.) come from the soil, but these are a small fraction of total mass. The reason dandelions grow fast specifically comes down to a few things: • Taproot advantage — they store carbohydrates deep in a thick taproot over winter. Spring growth is funded by that reserve, not dependent on new photosynthesis. They’re spending savings, not earning income. • Rosette geometry — flat leaves maximize light capture immediately without investing in a vertical stem first. • Temperature tolerance — they photosynthesize at lower temperatures than most competing plants, so they get a head start in early spring. The short answer: they’re mostly made of air and water, bankrolled by last year’s root reserves.​​​​​​​​​​​​​​​​

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