Our list of plants you should never plant with hydrangeas ... such as those that require dry or alkaline soil, may not thrive ...

Lavender is a sun-loving plant that thrives in well-drained, slightly alkaline soil. Plants need ample air circulation and plenty of room for growth. Ideal growing conditions for lavender are as ...

Before a nutrient can be used by plants it must be dissolved in the soil solution. Most minerals and nutrients are more soluble or available in acid soils than in neutral or slightly alkaline soils.