Answer: A standard type turf fertilizer with a 3-1-2 ratio (such as 15-5-10 for example) will be fine for your bottlebrush. Sprinkle 1/4 cup in an 8 foot diameter area around the plant and water in well. The first application should be in February. Additional applications can be made in early May and late July if the bush appears to need it.
Regarding the yellow leaves, check out which leaves are turning yellow. If young leaves near the tips are yellowing while older leaves remain green, your plant is exhibiting iron deficiency. If older leaves are the ones yellowing and dropping, the problem may be soggy growing conditions which can destroy roots by cutting off their supply of oxygen. Nitrogen deficiency can also cause yellowing in older leaves.
Other causes of yellow, dropping leaves are drought, herbicide injury, and physical damage to plant roots.
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