What is fertilizer, and why do cannabis plants need it?

Fertilizer provides essential nutrients like nitrogen, phosphorus, and potassium to help cannabis plants grow strong, healthy, and produce high yields. In most grow setups, regular feeding is required to avoid deficiencies and promote optimal growth.

What nutrients are essential for healthy cannabis growth?

Cannabis needs macronutrients like nitrogen, phosphorus, and potassium, plus secondary nutrients like calcium, magnesium, and sulfur. Micronutrients such as iron, zinc, and boron are also vital for plant health and development.

When should I start feeding cannabis plants nutrients?

Start feeding once your cannabis seedlings develop their first true leaves. In coco or hydro, feeding may begin as early as day 7–10. In soil, wait until the plant shows signs of slowed growth or pale lower leaves.

What do NPK values mean on cannabis fertilizer?

NPK stands for Nitrogen (N), Phosphorus (P), and Potassium (K), the three primary macronutrients. Ratios like 3-1-2 or 1-4-5 guide what stage of growth the fertilizer supports—veg or bloom.

How do I know if my cannabis plant is overfed or underfed?

Check the EC/PPM of your runoff water. If it's much higher than your input, nutrients are building up—overfeeding. If it's much lower, your plant may be hungry—underfeeding.

Search

Sign in or Register
()

close

Sign in or Register

Cannabis
Mushrooms
Sprouts & Microgreens
Fruits & Vegetables
Herbs & Spices
Bonsai
Gifts & Gear

Home
Cannabis Grow Tools & Calculators
Nutrient Monitoring
pH Target & Drift Tracker

pH Target & Drift Tracker

Newsletter Signup

Email Address

Footer Start

Information

Cannabis Grow Tools & Calculators
GroHaus Learning Center
About
Disclaimer
Mushroom Blog
Privacy Policy
Terms of Service
Shipping & Returns
Contact Us
Blog
Sitemap

Brands

AC Infinity
Myco Labs
FoxFarm
MarsHydro
North Spore
Gorilla
SunBlaster
GroXcess
Blueprint Controllers
California Lightworks
View All

GrōHaus LLC