Getting started -- Your Calla was grown in filtered light, not direct sun, so it should be acclimated to direct sun slowly. To prevent wilting or burning, start your plant with bright, indirect light for the first week, then every few days, move it into more light. Keep in mind that this Calla doesn't need much direct sun.
Soil -- Use a well draining mix. I use a mix of 1 part coir fiber to 1 part perlite (use small- or medium-grade perlite, not coarse-grade). An alternate mix is 2 parts quality potting soil to 1 part perlite or coarse horticultural sand.
Transplant your plant to a 1 gallon container (4 liters) (approximately), which will hold it for a few months.
Light -- Give it bright light, but not strong sun. This Calla doesn't need as much direct sun as most Callas. It grows fine in bright shade with some dappled sunlight. If you give it more sun, it will require more watering and feeding. Protect it from hot afternoon sun.
Watering -- This Calla likes consistently moist soil when it is not dormant. During warmer or sunnier weather, make sure the soil doesn't dry out. It reportedly can be grown in boggy conditions, but i haven't tried this.
Climate -- The Hercules Calla prefers mild temperatures. In warmer climates, shade it during the heat of the day and don't plant it where heat can accumulate, like near a sunny wall. The plant tends to go dormant during the summer, and grows actively the rest of the year. The tubers are winter hardy to Zone 8 (20°F/-6°C) if planted deep. But since the plant prefers to grow throughout winter, it's best to grow it in a pot and bring it indoors before frost strikes.
Repotting -- When the roots reach the bottom of the container, it should be transplanted to a larger container (or into the ground in frost-free areas). Each time you repot, bury it 1-2 inches (3-5 cm) deeper. After several years, it will need a large pot, such as 10 gallons (40 liters) or more, depending on the size of the tuber.
Winter strategies -- If you bring it indoors over the winter, try to keep some or most of the leaves intact, if possible. Removing the leaves may delay flowering.
Fertilizing -- Feed about every 2-3 months with a fertilizer that contains micronutrients (I use this). Cut back on the feedings if your plant goes through a dormant period.
Bugs to watch for -- Spider mites (tiny "dots" under the leaves), Aphids (green ones are hard to see), snails/slugs. Try using insecticidal soap before using stronger remedies, since some may harm the plant.
If any questions or problems come up, feel free to email me.
Have fun growing it!
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