How to perk up Grevillea lavandulacea Penola?
I planted a 5 gal Grevillea lavandulacea Penola in a half wine barrel about a year and a half ago. The first winter it flowered profusely but started to get scraggly over the summer, with new growth looking yellowish and unhealthy. I first thought it was nutrient deficiency, but having read that grevilleas don't like phosphate, I fertilized it only with blood meal (high nitrogen) which I mixed into the top soil layer. Average watering. I don't see any pests I could blame. Right now, mid December, I do see flower buds, but overall the plant still doesn't look as healthy as it did. Any advice?