My neighbor and I decided that rather than battle the weeds in the lawn in our swale, we would plant some dune sunflowers. I went out and bought some but did not get enough, so she bought a few more from a different nursery. The ones I planted are much bigger and have spread quite rapidly, the ones she planted are more compact and still have not had to be pruned. I like hers better! I have tried transplanting some of her rooted plants but they died. I have tried getting seeds from her plants but they never germinated.Is there a way ( besides a trip to the nursery) to get her plants to grow on my side so I can pull the big ones out?