If you mean the one used in farming: 4 hours. As with all trees, this is a minimum; it may randomly take longer.
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every herb takes 70 mins to grow
It takes Marigolds 17.5 min. to grow from a seed to the finished product.
Around 40 minutes. You can tell if a white flower has popped on the top of each plant
It depends how long you are on Runescape.
onion seeds take 40 minutes to grow fully but they change every 10 minutes. you have to wait the full 40 minutes till you can harvest them. Josh