Giving succulents water with the wrong pH can inhibit the plants' ability to take up nutrients, leading to less vigorous growth and yellowing. Urban and residential water tends to be alkaline, meaning it has a pH higher than 7, which is neutral.
Minerals optimally accessed in slightly acidic soil include nitrogen, phosphorus, potassium, sulfur, calcium, magnesium, iron, and manganese.
Rainwater is slightly acidic, which is why a few days after a storm, your succulents (all your plants for that matter) look amazing.
Aim for 5.5 to 6.5
During a recent Cactus & Succulent Society webinar, Ernesto Sandoval advised that the proper pH for watering succulents is approximately 5.5 to 6.5 (slightly acidic). Ernesto, manager of UC Davis' Botanical Conservatory, is renowned for his knowledge about growing succulents, their root development, ideal soil mixes and more.
Acidify the water
The pH of residential water and its mineral content varies by region. If yours has a high mineral content (typical of San Diego), add 2 tablespoons of vinegar per gallon of water. If your water is low in minerals (typical of Davis west of Sacramento), add one T per gallon.
Test to be sure
pH meter
Check your water with a pH meter. At about $13, a pH meter provides inexpensive peace of mind. Plus you can use it to test other liquids, including your drinking water, pool or aquarium.
Even better: Citric Acid
Citric acid
Also, for a gentler alternative to vinegar, use citric acid (about $15 for a 2-pound bag). Affiliate links.
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