🌿 Calathea

Use a humus-rich, aerated substrate that retains moisture but doesn't drain. A good mix is a high-quality potting soil or coir-based compost cut with 20-40% perlite/pumice plus fine orchid bark (or coir shavings) to keep oxygen around the roots. Keep the medium evenly moist (never soggy) and avoid dense garden soil or compact peat-based mixes; always use a pot with drainage. Slightly acidic to neutral mixtures are best.

Seedlings are rarely used for calatheas in cultivation (seeds are rarely available and results are variable); plants are normally propagated by dividing the rhizomatous tuft. Division (recommended) - When: late spring to early summer, when temperatures are sufficiently high and the plant is in full growth. - Preparation: water the plant the day before. Choose a clean work area and sterilized knives/shears. - Method: remove the rootball from the pot and gently separate it, following the natural rhizome slits. Aim for divisions with several leaves (at least 2-3) and a good proportion of healthy roots/rhizomes. Cut only where necessary to avoid tearing. - Potting mix: a loose, moisture-holding but non-draining houseplant mix (e.g. a coir-peat mix amended with perlite and fine bark) to keep roots aerated while remaining evenly moist. - Containers: pot each division in a small pot just big enough to accommodate the roots (avoid over-potting). Make sure there are drainage holes. - Aftercare: water thoroughly, then keep the mixture evenly moist (never soggy). Maintain warmth (approx. 20-27°C), bright indirect light and high humidity during the re-planting period. Reduce stress by avoiding direct sunlight, cold draughts and temperature variations. Notes on planting and repotting - Re-pot or divide the plant as it takes root (often every 1-2 years). Increase the pot size by one size at a time and keep the crown at the same depth as the previous crop.

Feed sparingly during the active growth period (spring to summer). Use a balanced, water-soluble houseplant fertilizer (or foliage plant formula) diluted to around 1/4-1/2 of the label dose, applied every 2-4 weeks after watering so that roots are not fertilized when dry. Calathea/Goeppertia orbifolia is sensitive to excess fertilizers and soluble salts; rinse the pot periodically with clear water to reduce salt build-up and prevent browning of leaf edges. In autumn and winter, when growth slows, reduce fertilizing to once a month at most, or stop altogether. Do not fertilize newly repotted or stressed plants for 4 to 6 weeks, and avoid slow-release fertilizers unless used very lightly.