What are the cultivation methods for potted canna lilies?

Canna lilies are robust and highly adaptable, preferring sunny, warm and hot environmental conditions, and are also relatively cold-tolerant. They are not demanding about soil and can grow in various soils, but grow best in deep, fertile soil. Their optimal growth temperature is higher than that of most flowers, at 25-30°C. Below, the editor of Qiannong Network introduces the cultivation methods for potted canna lilies!

For potted canna lilies, dwarf varieties should be chosen. Generally, a soil mix of leaf mold, garden soil and rice husk ash in a 1:1.5:0.5 ratio, with a small amount of soybean cake, bone meal and other fertilizers added, is best. In spring, from March to April, take out the tubers, remove the rotten parts, select stem tubers with 2-3 healthy buds and bury them in the potting soil, preferably with the bud tips exposed above the soil. Since canna lilies greatly love fertilizer and tolerate moisture, the pot should be watered thoroughly. When the 5th leaf appears, apply a decomposed top dressing once every 7-10 days, and water after fertilizing. Generally, apply a 1% ferrous sulfate fertilizer solution once a month, or add a small amount of plant ash, to promote straight and robust stems, lush green and thick leaves, and vivid flower colors. Stop fertilizing during the flowering stage. If placed in a relatively cool spot during flowering, the flowering period can be extended. When the flowers at the stem tips fade, the stems should be cut off from the base at any time to encourage new shoots. 

When potting canna lilies, using greenhouse sprouting treatment can make them bloom earlier. To do this, in February to March, cover the old roots shallowly with wet sand or loose peat soil, just enough to cover the rhizomes, and place them at 16°C to sprout. After the buds on the rhizomes sprout, cut the old stems into several pieces, each with more than 1 bud, and plant them separately in flower pots with a diameter of 10-12 cm. In April, repot once more, and depending on the actual situation, pots with a diameter of 15-20 cm can be used. In mid-May, move them outdoors for care or remove them from the pots and plant them in open ground, and they will bloom in July to August. 

Potted canna lilies sometimes show symptoms of scorched and yellowing leaf edges, mainly caused by applying too much ferrous sulfate or by drought and exposure to harsh sunlight. In hot summer, watering with water that is too cold can also cause scorched leaf edges. If fertilizer is applied too heavily during the peak of summer heat, it can even burn the rhizomes and “burn them to death.” Therefore, when the temperature is above 40°C, the canna lilies can be moved to a ventilated, cool place. Around Frost's Descent, potted canna lilies can be moved to a place at 5-10°C to overwinter safely, and fertilization should be stopped during overwintering.

For potted canna lilies, attention should be paid to leaf-roller pests from May to August each year to avoid damage to their tender leaves and flower clusters. They can be controlled by spraying with 50% dichlorvos 800-fold solution or 50% shamidson emulsifiable concentrate 1000-fold solution. Field-grown canna lilies occasionally suffer from cutworms, which can be caught by hand, or the soil around the roots can be drenched with trichlorfon 600-800-fold solution for control.