Cameron Just prove that chiles will grow and produce normal pods in a soil pH of 4.5 and 8.5. I doubt that you could even get chiles plants to survive in those conditions. Each plant has a seperate set of growing requirements. Cranberries won't grow on dry ground and chiles won't grow in bogs. L.B. >Mg at 7.0 at 4.5 these are way below min needs. >Going the other way nutrients of iron start dropping at above 6.0, >Manganese, at 7.0 and above Boron, copper and zinc >drop off, at a pH of 8.0 these are not available to plants. Which plant was the chart written for? How do some plants flourish in bogs at a pH of 4.0?