Pulling Ragwort - a Fibonacci sequence

Him:
Breathe. Smell. Weed stink. Ragwort stench. It needs swift action. Before the yellow flowers
seed. A good forking, a pulling, earth shaking, bag dumping. Poisonous liver-invader, livestock-
killer, one plant can birth thirty thousand. She says she'll miss the golden haze, the flap of
Cinnabar moths, her magnifying trips to black-and-gold striped caterpillars, Stinking Willies.

Her:
I don't know why he needs to pull it now, all the butterflies, moths and bees are feasting on
daisy flower-heads of Butterweed, Staggerwort. The Hebrideans aren't here yet; the farmer is
bringing them to overwinter. It's more dangerous to horses, cut up in their hay. The sheep
graze round it while it grows. The bright yellow could stay for now. Tansy. Herb. Balm.