5 Common Plant Nutrient Deficiencies (And How to Fix Them)

Are your plants looking a little off? Yellowing leaves, weak stems, or slow growth could be signs they’re missing essential nutrients. Here’s how to spot the problem—and solve it.

1. Nitrogen Deficiency

🟡 **Signs**: Pale yellowing on older leaves, stunted growth. 🌱 **Fix**: Apply a complete liquid fertiliser like our All-Purpose NPK 20-20-20 to promote lush green foliage and fast vegetative growth.

2. Phosphorus Deficiency

🟣 **Signs**: Purple or reddish leaves, especially on the underside. Poor root growth. 🌱 **Fix**: Use a fertiliser with a balanced phosphorus content to support strong root development and flowering.

3. Potassium Deficiency

🍂 **Signs**: Browning or crisping on leaf edges, weak stems, poor flowering. 🌱 **Fix**: Potassium-rich liquid feeds help boost plant resilience and flowering output.

4. Magnesium Deficiency

🧪 **Signs**: Yellowing between the veins on older leaves, while veins remain green. 🌱 **Fix**: Add a Cal-Mag supplement to restore magnesium levels and prevent further leaf damage.

5. Iron Deficiency

🌿 **Signs**: New leaves turn pale or white with green veins (chlorosis). 🌱 **Fix**: A gentle, chelated iron supplement can correct iron uptake issues—especially in pH-imbalanced soils.

When in Doubt, Feed Smart

The fastest way to fix nutrient issues is to use a balanced, complete fertiliser that covers all macro and micronutrients. Our all-in-one options make it easy—just dilute, apply, and let your plants thrive. Not sure what your plant needs? Send us a photo—we’re here to help →