Nutrients

Cactus Xmas Tree, also known as Thanksgiving cacti or Schlumbergera, need a liquid fertilizer that’s high in potash to grow vigorously and flower abundantly. You can fertilize your Christmas cactus once a month during the growing season, from spring to September, after it’s finished blooming and new growth appears. 

Here are some fertilizers you can use for Christmas cacti:

• 20-20-20 or 10-10-10 plant food: Dilute with water to 50% strength
• Bloom formula houseplant fertilizer: Use a half strength water soluble formula
• Magnesium sulfate solution: Dilute one teaspoon of magnesium sulfate with one gallon of water and fertilize monthly after blooming
• Miracle-Gro’s Indoor Plant Food: A liquid feed that’s high in potash
• Pennington UltraGreen All Purpose Plant Food 10-10-10: A blend of nutrients that can feed your plant for up to four months 

You can also try watering your Cactus Xmas Tree with milk to add calcium and trace amounts of nitrogen. Some say that coffee grounds are also beneficial because they contain nitrogen, phosphorus, and potassium, and they can help keep slugs and snails away from your plant.