Can Pine Needles That Don't Decompose Be Used for Planting Flowers?
In gardening practice, pine needles as a common mulch have received widespread attention. Many gardening enthusiasts wonder whether uncomposted pine needles can be directly used for planting. This article will delve into the correct use of pine needles from the perspectives of plant physiological characteristics and soil improvement.
Key Techniques for Planting Flowers with Pine Needles
Potential Risks of Raw Pine Needles and Countermeasures
Unfermented pine needles have a pH value of about 4.5-5.5, and their strong acidity may burn the fleshy roots of flowers like clivia. The high temperature above 60°C produced during the microbial decomposition process can damage the structure of plant root hair cells. It is recommended to mix pearl rock in a 1:3 ratio to buffer the acidity.
Efficient Fermentation Process
Using the sandwich composting method: bottom layer is 10cm of garden soil → middle layer is 15cm of pine needles → sprinkle EM bacteria → repeat stacking to 1 meter high. Turn the pile once a week to maintain 50% humidity, which can complete the composting in 45 days in summer and needs to be extended to 90 days in winter.
Key Points for Pest and Disease Control
The temperature range for the survival of pine wood nematodes carried by pine needles is -10°C to 40°C. It is recommended to use high-temperature steam treatment: place the pine needles in a breathable bag and treat them in a steamer at 100°C for 30 minutes to completely kill eggs and pathogens.
Scientifically treated pine needle soil can have a porosity of 35%-50%, making it especially suitable for acid-loving plants like orchids and azaleas. Mastering the core points of fermentation and disinfection, pine needles can be transformed into high-quality growing substrates, achieving resource recycling.