With large paddle-shaped fleshy green leaves edged in red, flapjack kalanchoe (Kalanchoe thyrsiflora), more commonly called simply flapjack, it makes a visual splash in the garden. It grows between 10 inches and 2 feet tall in a rosette pattern with the leaves growing out of the center stalk. Flapjack grows outdoors in U. S. Department of Agriculture plant hardiness zones 9 through 11 or as a houseplant. You can also treat it as an annual in cooler climates. A low-maintenance perennial succulent, flapjack needs minimal care to thrive.
Fertilize flapjack two to four times per year with the first application in the spring when new growth starts. Apply the last fertilizer in the fall then stop through the winter. Use a slow-release, balanced fertilizer, such as a 10-10-10 product, to supply continuous nutrients between feedings. Use 1 tablespoon for each 1 square foot of area around each plant. For larger beds, use 1 cup per 30 for each square feet.
Flapjack is a drought-tolerant succulent. Allow the soil to dry out on top between waterings. When watering, soak the soil 6 inches deep.
Flapjack grows well in pots, either indoors or outside. Indoors, set the bots in a bright room with indirect light, ideally in a spot between 50 and 50 degrees Fahrenheit. Outside, keep the pots in a sunny area of the patio or porch or set the planters in the garden.
Fertilizing Container Plants
Fertilize a container-grown flapjack every other week with 1/2 teaspoon of balanced 15-15-15 fertilizer. Mix the fertilizer into 1 gallon of water and use it to water the plant.
Watering Container Plant
Water a flapjack in a planter until the soil is thoroughly damp and extra water starts to leak out the drainage holes in the bottom, then wait to water until the top of the soil looks dry.
In USDA zones 9 and below, grow flapjack in planters outdoors in the summer and overwinter them inside. In fall, before the first freeze, move the pots to a sunny spot that stays between 50 and 60 F. Stop fertilizing for the winter and water only when the soil feels dry. In spring, after the last frost, return the container-grown flapjack outside.
Pests and Problems
Flapjack doesn't attract pests and rarely suffers from diseases and other problems.
Pruning and Trimming
This tidy succulent doesn't require any pruning or trimming during or after the growing season. The only exception is the flower stalk. After the flapjack flowers, cut out the dead flower stalk where it attaches to the main plant. Flapjack is grown as a foliage plant, and flowers only appear after three to four years, so in general you can get by without any pruning.