How to Grow Goldenrod. I suggest starting with a plant and the one I’ve chosen is short enough to grow in a pot or in a small space in your garden. Goldenrod blooms late summer and well into Fall providing a splash of vivid yellow when it’s most welcome. You’ll use the flowers to make a tincture (a mixture preserved in alcohol–in this case vodka). As you gather flowers, put them in a jar with vodka and keep in a sunny window. Continue to add flowers to the jar for the growing season. You can store your goldenrod this way or you can strain the liquid into a bottle and add a little honey to sweeten. This is very concentrated so you only need a little at a time, say a teaspoon.