Brugmansia flava, (Brugmansia X flava), or angel's trumpet, is a big, splashy tropical plant that will produce huge, yellow, trumpet-shaped blooms all year with a little tender loving care. Plant brugmansia near a patio or an open door or window to take full advantage of the plant's sweet nighttime scent. Brugmansia will tolerate light frost, but it won't survive a hard freeze. In cold winter climates, plant brugmansia in a large, heavy container so it won't tip over. Bring it indoors for the winter.
Plant brugmansia flava in full sunlight. Plant the brugmansia where it will be in morning sunlight but protected from the hot afternoon rays, if you live in a climate with hot, sunny afternoons. Planting brugmansia in containers should be done in heavy, well-balanced containers filled with commercial potting mixture. Be sure the container has bottom drainage.
Water brugmansia flava often to keep the soil evenly moist but not waterlogged. Water the plant daily during hot weather if it is in a container.
Fertilize brugmansia flava every two to three weeks, using a good quality, all-purpose fertilizer. Apply the fertilizer according to the directions on the package.
Remove the spent brugmansia blooms weekly so that the plant will continue to bloom year-round instead of stopping to produce seeds. Insert a stake into the soil next to the plant and tie the brugmansia to the stake with strips of nylon pantyhose if the brugmansia is tall and top heavy.
Bring the brugmansia flava indoors when temperatures fall below 40 degrees F. Trim the plant back to 8 to 10 inches with pruning shears. Put the brugmansia near a sunny window. Keep the soil moist.
Move the brugmansia outdoors as soon as temperatures will be consistently above 40 degrees F.