Are there plants that shouldn't be mulched?
Written by
Michael Sullivan
Reviewed by
Prof. Charles Hartman, Ph.D.Although most vegetables benefit from mulching, other plants can be negatively affected by standard mulching practices. Moisture-sensitive varieties like lavender, rosemary, and thyme can develop root rot if buried under a thick organic layer. Similarly, shallow-rooted seedlings may struggle and are at higher risk of disease if covered too soon before establishing a good root system.
Mediterranean Herbs
- Use gravel or crushed stone instead of organic mulch
- Maintain 6-inch clearance around woody stems
- Plant in raised beds with excellent drainage
- Water only when soil is completely dry
Seedlings and Transplants
- Wait until plants develop 3-4 true leaves
- Use cardboard collars instead of full coverage
- Apply thin 1/2-inch layers of fine compost
- Mulch pathways only until plants establish
Crown-Rot Susceptibles
- Strawberries need straw pulled back from crowns
- Asparagus requires decomposed mulch only
- Artichokes thrive with sand or grit amendments
- Always maintain air circulation at plant bases
Herbs indigenous to the Mediterranean region thrive in extreme climates with limited organic matter. When cultivated in moist conditions, their woody stems decay when covered with moisture-retaining mulches. I grow my herbaceous plants in beds filled with gravel, resembling their native environments, to keep the root system dry while providing necessary drainage.
Seedlings require timing considerations specific to their stage of growth. If the mulch is added too early, seedlings cannot establish simple contact with the soil for root development. Apply thin protective layers once the seedlings have developed true leaves. My process involves planting seedlings in biodegradable pots, which break down as the plants grow.
Strawberry plants, which have surface-growing crowns, have slightly different requirements for growing. Move mulch back about several inches from the plant centers. Raise the fruits by placing pine needles in nests underneath the plants. This will help moderate fungal problems and maintain the benefit of weed protection.
Apply these customized methods to your sensitive plants in the garden. Check the response to the modified method on your mulching technique. You will achieve adequate plant health while enjoying success in gardening with all your herbs and vegetables.
Read the full article: Mulching Vegetable Gardens: Ultimate Guide for Success
