What is the best pH for a citrus tree?
The ideal pH for a citrus tree is 6.0 to 6.5, if it’s on citrus roots, or 5.5 to 6.0, if budded/grafted to Poncirus roots or one of the Poncirus hybrids (citrumelo, citrange, etc.) Ideally, you should have your soil tested. A local extension office may do it for you, or even a local college or high school with a chemistry dept. Or you can buy fairly cheap pH meters or even cheaper pH testing paper (not very accurate, but perhaps close enough). For a meter, the traditional way to measure pH is to mix a soil sample with an equal volume of water, let it sit for about 1/2 hour, then test it with your pH meter. If the pH is too low, you’ll need to bring it up with some form of lime. If it’s too high, you bring it down with acid-forming fertilizer, sulfur, iron sulfate, aluminum sulfate, etc. Light-color leaves are more likely to be caused by too-high pH than too-low, although if the pale green is solid (same color veins as background, no striping, etc.), it seems likely to be more due to a
