Two to three years. That is the window NC State Extension gives for butterfly weed from seed to its first flowers. Year one hands you a thin leafy stem and not much else. The plant is busy under the soil, and you get the bloom once that root work is done.
My own seed packet sat in the kitchen drawer under a stack of takeout menus all winter. In spring I planted the lot along the driveway and two seedlings came up. One of them fell into shade by noon, so the next year I dug it up and moved it out into the open. It never came back. The taproot was deep by then, and this plant is best left undisturbed once it settles in.
That wait holds even when you give it perfect sun and soil. The taproot goes deep. The plant does not transplant well once that root is down. And it is drought tolerant, at home in the poor dry soils that leave your other perennials sulking. Poor ground is not a problem you have to fix first.
You trip on the wait because you judge the plant by what shows above the ground. A first-year seedling looks like it is going nowhere at all. Below the surface the root heads straight down, and it keeps heading down through a second summer while you wonder whether your seed was any good. Mark the spot so you do not weed your own seedling out by mistake. Butterfly weed keeps its own schedule no matter how much you fuss over the bed.
Year 1
Leaves and a low stem while the plant roots in. No flowers this season.
Year 2
Some plants reach blooming size and open their first clusters. Others want one more summer.
Year 3
Flowers are the norm by now, from May through August, and the same clump repeats it every year after.
Pick the spot before you open the packet. Sow Asclepias tuberosa seed where your ground is average to dry, drains well, and sits in full sun through the day. The plant is hardy from zone 3a to 9b, so most of the country can grow it, and a mature clump stays small at 1 to 2 feet (30 to 60 cm) tall. It takes up less room than you expect, which makes the front of a bed a fair place for it. Skip any low corner where water sits for a day after a storm.
Growing butterfly weed after that asks little of you. The drought tolerance means your hose stays coiled through most summers once the roots are down, and poor dry soil is no obstacle. It has some salt tolerance as well, so a bed near a salted walk is not out of the question. The leaves feed monarch, gray hairstreak, queen, and milkweed tussock moth caterpillars, which is why most people sow it.
The flowers pay you back for the patience. Clusters come in bright orange to yellow-orange, they open May to August, and they keep coming on a clump you never have to lift or divide. Chewed leaves in midsummer are a good sign here, not a problem you need to fix. The color reads from clear across the yard.
The sap on this milkweed is clear rather than milky, but it can still cause contact dermatitis. Pull gloves on before you cut stems or handle the pods.
If two or three seasons is longer than you want to wait, a nursery plant shortens it, though nothing in these listings promises you flowers in its first season either. Whichever way you go, choose the permanent spot first and treat it as permanent. Full sun and sharp drainage are the whole ask, and your plant keeps whatever ground you hand it.
Read the full article: 10 Orange Flowers Worth Planting
