What soil is best for herb window boxes?

Soil composition significantly determines the success of herbs in a window box. Mediterranean varieties, such as rosemary, prefer a gritty and well-drained mix to avoid root rot, while moisture-loving plants like mint thrive in compost-rich mixtures. The right balance means well-fed roots for lush seasonal growth.

For different families of herbs, create blends. Mediterranean herbs can be grown in a mixture of equal parts topsoil, coarse sand, and compost. Increase the amount of compost in mustard, other crucifers, or marsh-loving herbs to 50%. Always add earthworm castings for natural nourishment and to eliminate the danger involved in the use of chemical fertilizers.

Effective drainage is essential. Drill multiple drainage holes in the bottom of each box. Raise these boxes using pot feet so that air circulates around them. Add gravel to the bottom before the soil so that drainage is effective even in torrential rain.

Sustain soil health throughout the seasons. Top layers can be refreshed with a thin layer of compost each spring. Test the pH level each year with simple pH test kits. Move the position of your herbs to avoid depleting all nutrients from the same area. Using those techniques will allow you to continue to produce while not having to replace your soil completely.

Don't make the mistake of reusing soil. Avoid the temptation of not creating a drainage layer where the manufactured soil will go. Additionally, you need to sterilize containers annually to eliminate pathogens. You've just constructed a complex growing medium that provides for wonderful, flavorful herbs grown just outside your kitchen, to enjoy in your culinary creations.

Read the full article: 10 Best Window Box Herbs for Your Kitchen