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Considering this, why are the leaves on my angel trumpet turning yellow?
Water Trouble Improper watering can lead the leaves of the angel trumpet plant to turn yellow. Angel trumpets use a large amount of water during the growing season to promote their vibrant blooms, and if they don't receive enough water, you will notice the tell-tale signs of drought.
In respect to this, how often should I water my angel trumpet?
As a general rule, the plant will require fairly large amounts of water during the summer. If your brugmansia is in a pot, you may need to water it every day when the weather is hot and dry. Brugmansia in the ground needs water less frequently.
Feed young, newly planted angel's trumpets using a balanced fertilizer with an N-P-K (nitrogen-phosphorus-potassium) ratio of 15-15-15, which will encourage healthy root, foliage and flower growth. Dissolve 1/2 tsp. of fertilizer in a gallon of water. Replace one watering per week with the fertilizer solution.