When to plant Coneflower 'Green Jewel'?

Rudbeckia 'Green Jewel' thrives in full sun or partial shade, making it adaptable to most garden positions. It tolerates a wide range of soil types—loam, clay, or sandy—but prefers ground that drains reasonably well while retaining some moisture. Before planting, dig over the soil to a spade's depth and work in a few handfuls of garden compost or well-rotted manure to improve structure and fertility, especially if your soil is heavy clay or very light sand. Plant container-grown specimens in March, April, May, September, or October. Avoid planting during frosty spells or when the ground is waterlogged. Dig a hole slightly wider than the root ball and to the same depth, so the top of the root ball sits level with the surrounding soil surface. Space plants 40 cm apart to allow for their mature spread of 30–45 cm and to ensure good air circulation, which helps prevent mildew. After planting, firm the soil gently around the roots to eliminate air pockets, then water thoroughly to settle the plant in. Apply a 5 cm layer of mulch—garden compost, leaf mould, or well-rotted manure—around the base, keeping it clear of the crown to prevent rot. This conserves moisture and suppresses weeds while the plant establishes. Water regularly during the first growing season, especially in dry weather, until the roots have spread into the surrounding soil. Spring plantings will usually flower the same summer; autumn plantings establish over winter and flower the following year.