What is the ideal soil pH for most ornamentals?

What is the ideal soil pH for most ornamentals?

• A. 3.5-4.5
• B. 5.5-7.5
• C. 7.6-8.5
• D. 9.0-10.0

Answer: (B)

Soil pH controls how nutrients are dissolved and taken up by plant roots. Most ornamentals grow best when the soil is slightly acidic to near neutral, because in this range essential nutrients are available in balanced amounts without causing toxicities or severe deficiencies. The range around 5.5 to 7.5 hits that balance: nutrients like nitrogen, phosphorus, and potassium are reasonably available, and micronutrients aren’t typically locked up or excessive. If the soil is too acidic (below about 5.5), some nutrients can become overly available and toxic (and calcium/magnesium uptake can be hindered). If the soil is too alkaline (above about 7.5), iron and manganese become less available, which often causes chlorosis, and phosphorus availability can drop. Therefore, the 5.5–7.5 range fits the needs of most ornamental plants. Remember, some exceptions exist—acid-loving plants prefer lower pH, while others tolerate slightly higher pH—but for most ornamentals, this mid-range is ideal.

Soil pH controls how nutrients are dissolved and taken up by plant roots. Most ornamentals grow best when the soil is slightly acidic to near neutral, because in this range essential nutrients are available in balanced amounts without causing toxicities or severe deficiencies. The range around 5.5 to 7.5 hits that balance: nutrients like nitrogen, phosphorus, and potassium are reasonably available, and micronutrients aren’t typically locked up or excessive. If the soil is too acidic (below about 5.5), some nutrients can become overly available and toxic (and calcium/magnesium uptake can be hindered). If the soil is too alkaline (above about 7.5), iron and manganese become less available, which often causes chlorosis, and phosphorus availability can drop. Therefore, the 5.5–7.5 range fits the needs of most ornamental plants. Remember, some exceptions exist—acid-loving plants prefer lower pH, while others tolerate slightly higher pH—but for most ornamentals, this mid-range is ideal.