Saint Paul, MN (Zone 4b) | October 2011 | positive
Mine has been growing up a foot taller every year, now 8ft? Branching. I rarely water or maintain it. It has not spread much, just vertic...Read Moreal height increase. It does have the gray down foliage and it is not 'Hairy Sunflower' Helianthus hirsutus. My seeds were said to be all non-viable.
Offered by SSE with the following description: "This robust sunflower spreads slowly by rhizomes. An abundance of butter-yellow flowers a...Read Morere borne on soft, hairy stems. A favorite with many kinds of birds, so hurry to save seeds. Plants often grow 6' tall and thrive even on poor, dry soils. Hardy to zone 4."
Mine has been growing up a foot taller every year, now 8ft? Branching. I rarely water or maintain it. It has not spread much, just vertic...Read More
Offered by SSE with the following description: "This robust sunflower spreads slowly by rhizomes. An abundance of butter-yellow flowers a...Read More
Plant is touted as a native prairie plant. Looks more fragile than it is. It does spread with some runners - so give it room.