Fireweed establishes itself in freshly disturbed areas (like after a fire or volcanic explosion), grows like mad, hits peak population quickly and then moves on.
Rain collects on a stalk of fireweed as people fish below in Anchorage’s Ship Creek on Saturday, July 15, 2023.
For starters, fireweed is a hardy perennial, not an annual. This means plants are around for more than one season. Fireweed generally spreads by producing root-like structures, rhizomes, that form and grow under ground. Rhizomes are capable of producing new plants. This is asexual reproduction. In fact, some years a freed plant may not bloom. It will reproduce via rhizomes.
There are little hairs on the tips of fireweed seeds which are impacted by humidity and help determine the height of the seed’s drift when caught by a breeze. You should be amazed to learn that fireweed seeds can travel over 175 miles. Given the great number of seeds and the distance they can move, one of them will surely drift to the ground and find a new area to start a new colony.
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