Dwarf Nagami Kumquat Concerns
I have a potted Dwarf Nagami Kumquat that I've had for about a year. When I first got it, it was bearing fruit. It was planted with a potting soil, I can't recall the brand. The pot is a 1/2 whiskey barrel. It's on the south side of my home here in SoCal and gets all sun most all day. Besides B12, when it was 1st transplanted, I've given it 1 Miracle-Grow citrus spike twice now. I water it every other day enough to the point where the soil is always moist, but not sopping. The pot/barrel is raised up on a few bricks to allow any extra water to drain through the bottom.
My concerns are that the leaves are losing color and some are dried. The other is that it's no longer producing. I had one years ago that seemed to produce quite a bit quite often.
I tested the soils N, P, K, and Ph with a rapidest kit from Luster Leaf. It showed a depletion of Nitrate and deficiency in Phosphate.
My question is how much should I add of each and how often? Would a mixed fertilizer be better than buying them separately? What brands should I look for at Lowes, HD or Armstrong? Lastly, should I water more often or less? Other advise?
Thanks for any help or suggestions?
Here is a link that might be useful: Kumquat Image