I just applied my first application of alfalfa 2.5 weeks ago and also am seeing great greening up of most of the lawn. I have some thin patches as well, but I've traced the problem to severe soil compaction. I'm aerating the compacted area and it is showing some progress. You may have to track down a secondary problem with your weak areas.

After researching, I find that alfalfa meal decomposes fast and gives off quick heat, more so than alfalfa pellets. I cooked a geranium to death by planting in a clay mixed with alfalfa meal. I did the same with 2 rhododendrons in hot and dry summer. Years ago we detached our lawn in late fall and stored bags of grass clippings in the garage .. the entire garage was heat up, despite 40 degrees outside. NPK of alfalfa pellets is 2-1-2 ($17.99 for 50 lbs. bag), NPK of soy bean meal is 7-2-1 ($20 for 50 lbs. bag), and NPK of crack corn is 1.65 / 0.65 / 0.4 ($2.69 for 10 lbs. bag) at feed store. NPK of alfalfa hay is 2.45 - 0.5 - 2.1, sold for $8 per bale at the feed store. Corn is alkaline, has anti-fungal property. Soybean meal is also alkaline. Alfalfa meal is slightly acidic and naturally high in sugar, great for fungal germination. See below discussion "Afalfa Meal Heating Up Soil" in Organic Gardening Forum: â¢Posted by mprevost 7 (My Page) on Sun, Jan 13, 08 Throughout that time I've used only bagged composted chicken manure, alfalfa meal, soybean meal, and various mulches (leaves, grass clippings) to fertilize my soil. I have not seen this heating up occur without significant concentrations of alfalfa meal. Without a lot of alfalfa meal, it does not heat up. But if you put a lot of alfalfa meal under mulch or in a hole, it gets REAL hot in a couple of days. Like as hot as a very hot compost pile. 150 deg F or so. " **** From Straw: I haven't tested soy bean meal, so I won't recommend that. I tested cracked corn (grinded smaller with NutriMill flour grinder) ... awesome result, shiny leaves & many buds. Birds like to eat that stuff. The growth can't compare to alfalfa meal, but I'm aiming for buds and health in hot summer, and not top growth. Alfalfa hay is $8 per bale, best to mix that in with dirt, since the hay is hard to decompose, plus matting-up, blocking water. Some info. from the lawn forum: â¢Posted by lee_in_iowa 4 to 5 on the lin (My Page) on Thu, Apr 14, 11 at 11:35 Boy, I can't recommend the soybean meal. Never again! I tilled it into the top 4-6 inches of my raised beds one year and it grew me a bumper crop of cutworms and armyworms. It attracted pests I had never had before. For myself, I like to ask for bales of alfalfa hay." Here is a link that might be useful: Reference link on Organic Fertilizers This post was edited by Strawberryhill on Mon, Sep 2, 13 at 10:02

Maybe this will help. I don't know much about this plant, I live in NC, after all, but I love tropical plants. Here is a link that might be useful: Carambola

I don’t think I’ve ever seen one, but perhaps Amphicarpa.