While compost is an excellent way to condition your soil and fertilize your plants, it may be too alkaline for some types of plants. For example, azaleas, blackberries, camellias, citrus trees, and rhododendrons need more acidic soil conditions than most other plants.
If you’ve planted these species in your garden and they seem to be struggling, test the soil’s pH with an electronic soil tester or chemical testing kit. You can offset excess alkalinity by mulching with peat moss or pine needles or bark. Used coffee grounds and tea leaves are also effective, and old leftover coffee and tea can make a refreshing drink for acid-lovers.
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