Author: Manolo MJF

A detailed calendar of cannabis diseases in a temperate climate – your monthly guide to outdoor and greenhouse threats. Learn when to expect mold, rot, and pests, how to protect your crop, and keep harvests healthy all season long. Outdoor mould calendar and cannabis disease season made simple for growers.

Learn about the real risks of algae and biofilm in hydroponic systems. Discover how these hidden threats disrupt water quality, sensor readings, and plant health—even if they don’t cause direct disease. Practical tips from a seasoned grower for managing “algae hydroponics” and “biofilm in the tank

Discover how to identify, prevent, and manage collar/crown rot in cannabis (crown rot cannabis). Learn about the key symptoms near the soil line, the impact of watering routines, and related root diseases that threaten healthy grows. Essential knowledge for growers who want to avoid stem base rot and maintain vigorous plants.

Learn how to recognize TMV-like (Tobacco Mosaic Virus-like) symptoms in cannabis, avoid common misdiagnoses, and distinguish viral mosaic from nutrient deficiencies and phytotoxicity. Find practical answers to essential grower questions and keep your crop safe from mosaic viruses.

Cannabis plant physiopathologies—like tip burn, light burn, heat stress, and salt damage—often look like diseases but aren’t. Here’s a fast, practical diagnostic cheat sheet: learn how to spot, fix, and avoid these problems, and stop panicking over every brown spot.

Anthracnose in cannabis (necrotic, dried patches on leaves, petiole and vein damage) is a sneaky fungal disease that's easy to overlook or misdiagnose. Learn to recognize the signs, react quickly, and protect your plants from major trouble—practical advice from an experienced grower, simple treatments, and the mistakes most newbies make, all explained in everyday language.

Alternaria leaf spot in cannabis (brown, concentric spots) is a fungal disease often mistaken for nutrient deficiencies or other issues. Learn practical tips to identify, treat, and prevent it—quick diagnostics, effective remedies, and essential FAQ for every grower.

Cannabis leaf septoria, or yellow leaf spot, is a common fungal disease that can devastate your grow if ignored. Learn how to recognize early symptoms, prevent an outbreak, and treat infected plants with practical methods, recommended fungicides, and natural remedies—clear advice from a seasoned grower.

HLVd (“dudding disease”) in cannabis – symptoms, transmission routes, hygiene protocols with specific disinfectant doses, mother plant testing, and rescue plans for when the pathogen enters the greenhouse.

Powdery mildew on cannabis – how to recognize it early, limit the risk, and what actually works when you spot the tell-tale white dust (biological solutions, sulfur, contact fungicides).

Fusarium in cannabis cultivation – symptoms, prevention, and effective treatment methods.

In cannabis growing—especially hydroponics—reverse osmosis is valued mainly for the ability to control water quality completely.