Solidago (9)
I believe the answer is:
goldenrod
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">solidago</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that solidago can be written as goldenrod)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for goldenrod that I've seen before include "Plant with tall spikes of yellow flowers" , "Yellow-headed garden plant" , "Autumnal flower" , "Yellow-spiked garden flower" , "Tall-spiked plant" .)