Batten Blooms
Golden Alexander
Zizia aurea

Golden Alexander

3a–8bHardiness zone
SpringSummer
Peak bloom windowZone 6b · frost-offset weeks
Winter
Not in bloom
Spring
Peak bloom
Summer
Not in bloom
Fall
Not in bloom
Peak bloom
In bloom
Background

Zizia aurea is a native herbaceous perennial in the carrot family (Apiaceae), ranging from the eastern Great Plains to the Atlantic coast. It produces flat-topped yellow umbels in mid-spring through early summer, making it one of the earliest native perennials to supply nectar to bees, small wasps, and beneficial flies.

Plants grow in prairies, open woodlands, and stream margins, tolerating full sun with consistent moisture through partial shade under a light canopy. They spread slowly by rhizome and self-seed to form modest clumps. Seeds require cold-moist stratification; fall direct sowing lets winter do the work naturally. A 2–3 inch organic mulch layer aids moisture retention while plants establish. Soil pH of 5.5–7.0 suits it well, and it performs reliably in rain gardens and low spots that experience periodic wet conditions.

Golden Alexander is one of the documented primary larval hosts for the black swallowtail butterfly (Papilio polyxenes) and the Ozark swallowtail. Caterpillars feeding on the foliage are ecologically intentional - this is a core reason to plant the species. Deer generally avoid it.

Good companions
Wild GeraniumSpiderwortFoamflowerColumbine
Care guide
SunFull sun to part shade - 4+ hours daily
Water1 inch per week; tolerates moist to average soil
SoilMoist to average, well-draining; pH 5.5–7.0
Spacing12–18 inches
Height18–36 inches
Zone3a – 8b
Native Region
Native range, from wild records. Select a state for its native plants.

Ecoregions:Northern ForestsEastern Temperate ForestsGreat Plains

Direct sowFrost hardy
Seasonal tasks
winter
sowDirect sow seeds outdoors; they require cold-moist stratification through winter to germinate the following spring.
buyOrder seed - about two months before sowing
sowTo start indoors, cold-stratify seeds in moist vermiculite or damp paper towels at 35–40°F for 60–90 days, then move under grow lights.
spring
watchInspect developing stems and umbels for aphid colonies; dislodge with a firm water spray or apply insecticidal soap if populations are heavy.
plantTransplant container-grown seedlings into prepared beds after last frost; water in well and mulch around the crown.
summer
watchCheck foliage through summer for black swallowtail caterpillars; they are intentional feeders on this host plant and should be left undisturbed.
cutAllow seed heads to ripen and drop naturally for self-seeding, or collect seeds in paper bags as pods turn brown and begin to split.
buyOrder seed - about two months before sowing
fall
sowDirect sow seeds outdoors; they require cold-moist stratification through winter to germinate the following spring.
cutCut stems to ground level after hard frost kills back the foliage, or leave standing through winter for small-bird foraging.
Common problems

Powdery mildew

Symptoms

White or grey powdery coating on leaves - usually starting on older growth in humid conditions or when nights cool.

Treatment

Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.

Pests

Aphids

Aphididae →
Symptoms

Clusters of small soft insects on new growth and flower buds.

Treatment

Knock off with a strong jet of water. Ladybirds and lacewings are natural predators. Insecticidal soap as last resort.

From the field journal
Fall reading

Garden design for attracting butterflies

A butterfly garden needs two things, nectar for the adults and the right host plant for the caterpillars, and the design is mostly deciding where each one goes.

Read →