The redwood's range seems to be determined more by the distribution of summer fog than the actual amount of rainfall. Fog actually condenses on tree crowns and drips down to water the roots of the tree during the dry summer months. The humidity of fog also decreases trees' water loss from evaporation and transpiration. Redwoods can even generate their own fog, from the up to 500 gallons of water a large tree may transpire into the air per day. Redwood located beyond the fog belt is limited to moist sites.l
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