Hibiscus need draining pots - they don't like to constantly have wet feet. If you have not repotted - I would check the root ball - make sure its not too bound up. the leaves change shape as they grow, sometimes the edges change. they also get cranky with rapid temperature changes and drop leaves. if you haven't already please take a look at www.hiddenvalleyhibiscus.com - they have an excellent breakdown of the many ailments a that may be affecting your plant.

Some of the tomato plants have yellow leaves on the bottom. This is even with trimming the stalk at least a foot from the bottom. I've read that it could be a need for magnesium or uneven watering. Is this potentially damaging to the plant/fruit? We've had a ton of rain lately.

Did you notice if there were fruit/blooms on the branches with yellow leaves? FWIW, I agree that coir has 'issues' that require work-arounds if you want to use it as a substitute for peat. One of the issues is the tendency for coir to be high in dissolved solids (salts) when processed in sea water. There are other considerations that shouldn't be ignored when using coir as a significant fraction of a container grow medium. I wrote a short piece that reflects some of the research I did re coir and CHCs, as well as my own experiences while experimenting with it. Peat vs. Coir Sphagnum peat and coir have nearly identical water retention curves. They both retain about 90-95% of their volume in water at saturation and release it over approximately the same curve until they both lock water up so tightly it's unavailable for plant uptake at about 30-33% saturation. Coir actually has less loft than sphagnum peat, and therefore, less aeration. Because of this propensity, coir should be used in mixes at lower %s than peat. Because of the tendency to compact, in the greenhouse industry coir is primarily used in containers in sub-irrigation (bottom-watering) situations. Many sources produce coir that is high in soluble salts, so this can also be an issue. Using coir as the primary component of container media virtually eliminates lime or dolomitic lime as a possible Ca source because of coir's high pH (6+). Gypsum should be used as a Ca source, which eliminates coir's low S content. All coir products are very high in K, very low in Ca, and have a potentially high Mn content, which can interfere with the uptake of Fe. Several studies have also shown that the significant presence of phenolic allelochemicals in fresh coir can be very problematic for a high % of plants, causing poor growth, reduced yields, and chlorotic foliage. I haven't tested coir thoroughly, but I have done some testing of CHCs (coconut husk chips) with some loose controls in place. After very thoroughly leaching and rinsing the chips, I made a 5:1:1 soil of pine bark:peat:perlite (which I know to be very productive) and a 5:1:1 mix of CHCs:peat:perlite. I planted 6 cuttings of snapdragon and 6 cuttings of Coleus (each from the same plant to eliminate genetic variances) in containers (same size/shape) of the different soils. I added dolomitic lime to the bark soil and gypsum to the CHC soil. After the cuttings struck, I eliminated all but the three strongest in each of the 4 containers. I watered each container with a weak solution of MG 12-4-8 with STEM added at each watering, and watered on an 'as needed basis', not on a schedule. The only difference in the fertilizer regimen was the fact that I included a small amount of MgSO4 (Epsom salts) to provide MG (the dolomitic lime in the bark soil contained the MG, while the gypsum (CaSO4) in the CHC soil did not. This difference was necessary because or the high pH of CHCs and coir.) for the CHC soil. The results were startling. In both cases, the cuttings grown in the CHC's exhibited < 1/2 the biomass at summers end as the plants in the bark mix. I just find it very difficult for a solid case to be made (besides "It works for me") for the use of coir or CHC's. They're more expensive and more difficult to use effectively. The fact that some believe peat is in short supply (no where near true, btw) is easily offset by the effect of the carbon footprint of coir in its trek to the US from Sri Lanka or other exotic locales. That's the view from here. YMMV Coir Study: https://sites.google.com/site/plantandsoildigest/usu-crop-physiology-laboratory/coconut-coir-studies Al

this is a duplicate post... answers started here: https://www.houzz.com/discussions/6174440/what-is-causing-the-leaves-on-my-av-to-turn-yellow#n=2