Black Eyed Susan Care (Rudbeckia fulgida var. sullivantii 'Goldsturm')

This perennial thrives in full sun but tolerates some light shade, especially in hotter regions.

• Aim for 6–8 hours of direct sun daily, with at least 4–6 hours of strong morning sun for best flowering and sturdy stems.
• It tolerates light afternoon shade, which can reduce heat stress and leaf scorch in hot summers without severely reducing bloom.
• In deep or prolonged shade, Black Eyed Susan produces fewer flowers, taller and weaker stems, and may flop or lean toward brighter areas.

This plant prefers evenly moist but not soggy soil, especially during establishment and peak summer growth.

• Water when the top 3–5 cm of soil feels dry, soaking the root zone deeply rather than using light, frequent sprinkling.
• During the first growing season, monitor rainfall and irrigate after 3–5 dry days; once established, it tolerates short dry periods if soil is well-drained.
• Yellowing lower leaves and limp, pale foliage can indicate overwatering, while dull, drooping leaves and dry, crumbly soil suggest underwatering for Rudbeckia fulgida var. sullivantii 'Goldsturm'.

This hardy perennial handles a wide temperature range but grows best in moderate summer conditions.

• Optimal growth occurs around 65–80°F (18–27°C), supporting strong stems, abundant blooms, and steady root development.
• The plant is cold-hardy in many temperate climates, with dormant crowns tolerating winter lows well below 0°F (-18°C) when soil-drained and mulched.
• Summer heat up to about 90–95°F (32–35°C) is tolerated if soil moisture is maintained; in prolonged heat waves, afternoon shade and mulch help reduce stress and leaf scorch.

Humidity is rarely a concern for this species in typical outdoor conditions.

This perennial prefers moderately fertile, well-drained, loamy ground that stays evenly moist but not saturated.

• Use a loam-based soil with 30–40% compost to provide structure and steady nutrients.
• Ensure drainage by incorporating coarse sand or fine gravel, especially in heavier clay sites.
• Aim for a slightly acidic to neutral pH around 6.0–7.0 for reliable growth of Rudbeckia fulgida var. sullivantii 'Goldsturm'.
• Avoid compacted or waterlogged areas; loosen the top 20–25 cm to improve aeration before planting.

This species grows reliably in containers outdoors if given sufficient root volume and drainage.

• Choose a pot at least 30–35 cm wide and deep so the spreading root system does not dry out too quickly.
• Select a heavier material such as ceramic or thick-walled terracotta to stabilize the tall, flowering stems in wind.
• Raise the container on feet or bricks so drainage holes stay clear and excess water can escape freely after heavy rain.

Rudbeckia fulgida var. sullivantii 'Goldsturm' needs only modest feeding in average garden soil.

• In spring, apply a thin layer of compost or a balanced slow-release fertilizer (around 10-10-10) over the root zone.
• Feed once at the start of the growing season; avoid repeated high-nitrogen products that cause floppy growth.
• If using liquid fertilizer, dilute to 1/2 strength and apply to moist soil to prevent root burn.
• Stop feeding in late summer; do not fertilize dormant clumps in fall or winter.

Pruning supports dense growth and sustained flowering in Rudbeckia fulgida var. sullivantii 'Goldsturm'.

• In midsummer, deadhead spent blooms with clean hand pruners to extend flowering and reduce self-seeding.
• Remove dead, diseased, or storm-damaged stems whenever seen to maintain plant health.
• In late fall or very early spring, cut back old stems to 5–10 cm above ground to tidy and stimulate new shoots.
• Thin crowded clumps by removing a few inner stems to improve airflow and reduce mildew risk.

This perennial is usually grown in beds or borders and is moved mainly by transplanting established clumps.

• Plan division and transplanting in early spring or early fall when temperatures are mild and soil is workable.
• Transplant when clumps become crowded, flower less, or invade neighboring plants, typically every 3–5 years.
• Dig up the clump with a sharp spade, then split it into sections with healthy roots and several shoots each.
• Replant divisions at the same depth, water thoroughly, and keep soil evenly moist for 1–2 weeks to limit stress.

Rudbeckia fulgida var. sullivantii 'Goldsturm' is commonly propagated by division and sometimes by seed.

• Divide mature clumps in early spring or early fall, lifting and splitting them into several vigorous sections.
• Replant divisions into moist, well-drained soil, spacing 30–45 cm apart to allow future spread.
• For seeds, sow in late fall outdoors or after a short cold stratification period indoors to improve germination.
• Provide bright light and lightly moist soil for seedlings, then harden off before planting into garden beds.

This perennial is cold hardy in most temperate climates and usually needs minimal winter care.

• Tolerates frost and snow once established, with roots surviving typical winter lows in many USDA zones.
• After hard frost, either leave seed heads for wildlife or cut stems down to near ground level.
• Apply a 5–8 cm layer of mulch around the crown to steady soil temperature and moisture.
• Container-grown Black Eyed Susan may be moved to a sheltered, unheated area to avoid repeated freeze-thaw cycles.