In addition to calcium, wood ash contains 5-7% potassium and 1.5-2% phosphorous, both key nutrients for plants. Although it can be a decent fertilizer, McKinley points out that other fertilizers might ...
Fill your raised beds with well-draining, nutrient-rich soil for better vegetables.
If your lavender is struggling to flower, you may need to look at your soil. This herb prefers well-draining soil, which can be achieved with some additions.