Use it alongside Holland Secret Micro

Perfect for Automatic Fertigation Systems

It's the perfect finisher in a system that's been trusted by gardeners for decades

Nutradip Portable Nutrient Meter Manual (PDF)

They are also a readily available source of nitrogen

Surge Plus - (1-0-0) Size:1.5kg Use it alongside Holland SecretProduct Description Want to simplify your grow and save money? Then you need Surge Plus, the 7 in 1 additive that combines seven separate plant nutrients into one powerful mix. This means fewer nutrients to buy and mix on your end. This plant additive combines the power of sea kelp, amino acids, molasses, carbohydrates, humic acid, fulvic acid, and vitamin B1 to elevate your plants to the next level. If you're looking for the best plant nutrients,