🌿 Arum

Plant Arum in humus-rich, woodland-type soil that retains moisture in spring but drains easily (avoid waterlogged or compacted soils, which can rot tubers). Amend with leaf mold, well-decomposed compost or other organic matter to improve structure and moisture absorption. Many commonly grown Arums (e.g. A. maculatum/A. italicum) perform best in neutral to alkaline, often calcareous/calciferous soils; avoid highly acidic, nutrient-poor substrates. In containers, use a high-quality potting soil or potting mix, cut with compost/leaf mold and a drainage component (e.g. gravel/perlite); maintain regular humidity during active growth and allow to dry out somewhat during the dormant period.

Planting dormant tubers/rhizomes is the most reliable method for establishing arum; seeds are possible but slower. From seed: - Use fresh seed if possible; viability decreases with storage. - Sow in autumn in pots or trays of humus-rich, draining compost. - Cover lightly (the thickness of the seed with compost or gravel) and water gently. - Store outdoors in a cold frame or sheltered spot to ensure natural winter cooling; keep evenly moist but not soggy. - Germination often takes place in spring, but can be irregular and take more than one season. - Transplant when seedlings are large enough to handle; grow in pots until well established, then plant out. Tuber/rhizome planting: - Plant during the dormant season (usually autumn for hardy arums; spring planting also works for many other plants). - Choose moist but well-drained soil, rich in organic matter, with partial or light shade. - Plant tubers 2-3 times their height (usually 10-15 cm), spaced 15-30 cm apart. - Water after planting; keep soil slightly moist during establishment. - Allow foliage to die back naturally; avoid disturbing the planting site once established.

Arum generally needs little fertilizer if grown in humus-rich soil. Each year, in autumn or early spring, top-dress with leaf compost or well-decomposed compost to maintain fertility. If growth is weak (especially in pots or poor soils), apply a light dose of a balanced, slow-release fertilizer in early spring as shoots emerge; avoid heavy or high-nitrogen fertilizers, which can promote sluggish growth. Do not fertilize during the summer dormancy period; resume fertilization only when new growth starts.

Apply a light, loose mulch of leaf mold, well-decomposed garden compost or shredded dead leaves in autumn, after foliage fall (or late winter), to mimic woodland leaf litter, moderate soil temperature, improve humus and conserve moisture. Keep mulch a few centimetres away from the crown/tuber area, and avoid heavy, damp mulches that can retain moisture and promote rot; remove mulch lightly when shoots emerge in spring.