To grow large, dense, and compact heads of cabbage, summer fertilization is crucial. During this phase, the plant transitions from producing loose leaves to forming the “head” (the head), and its nutritional needs change.<\/p>\n\n\n\n
Here’s a practical guide on what to use and how to intervene during the summer.<\/p>\n\n\n\n
Potassium ($K$): This is the real secret to dense, compact heads. It helps the plant regulate water, accumulate sugars, and make tissues robust and resistant to disease.
Phosphorus ($P$): Supports the root system, ensuring the plant absorbs enough water even on the hottest days.
Micronutrients (Boron and Calcium): Essential for cabbage. Calcium deficiency causes “marginal wilt” of the inner leaves, while boron deficiency makes the stems hollow and rot.<\/p>\n\n\n\n
Organic Options (Recommended)
Fluid vinasse: A liquid organic fertilizer of plant origin, very rich in potassium and slow-release nitrogen. It’s perfect for summer because it’s quickly absorbed by the roots.
Wood ash: If you’re growing naturally, ash (from untreated wood) is a treasure trove of potassium and calcium. Sprinkle a handful around each plant and gently mix the soil.
Mead or comfrey macerate: Comfrey (Symphytum officinale) is an exceptional regrowth plant, rich in potassium. Used for irrigation, it provides an immediate boost to head formation.
Mineral Options (Conventional)
NPK fertilizers balanced with potassium: Look for formulas such as 11-15-20 or similar (where the last number, the potassium, is the highest).
Calcium nitrate: Apply in early summer if you notice leaves tending to yellow or burning at the edges. It provides readily absorbable calcium.<\/p>\n\n\n\n
Late June \/ Early July (Growth Phase): Apply a potassium-rich liquid fertilizer (such as vinasse) every 12-15 days along with the irrigation water.
August (Cushion Formation): If you haven’t done so before, supplement with calcium and boron (often found in specific vegetable garden fertilizers) to prevent internal rot. Stop using fertilizers with a high nitrogen content.
\u26a0\ufe0f Golden rule for summer: Never apply fertilizer to completely dry soil. Water lightly the day before, or apply the fertilizer diluted in water in the evening, when temperatures drop.<\/p>\n\n\n\n
Extra tip: The importance of water and mulching
The best fertilizer in the world won’t work if the plant is thirsty. To ensure proper absorption of nutrients and a dense head of growth:<\/p>\n\n\n\n
Water consistently: The soil should always be moist (but not soaking wet). Sudden changes in water levels cause cabbages to split.
Use mulch: Cover the soil around the cabbages with straw or dry grass clippings. This keeps the soil cool, retains moisture, and prevents the summer sun from burning the surface roots that absorb fertilizer.<\/p>\n","protected":false},"excerpt":{"rendered":"
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