Yellow Leaves, pH Problems, and CalMag Deficiencies: What Your Weed Growing Journal is Telling You

If you're tracking your plants with a cannabis grow journal or using a weed growing app like PLnTrk, yellowing leaves are often the first sign something’s off. Whether you're logging symptoms or reviewing timelines, capturing this data early can help prevent bigger yield issues down the road.

Spotting Yellow Leaves in Your Grow Log

Yellowing bottom leaves are one of the most common symptoms recorded in any weed growing journal. If you’re seeing lower canopy die-off, it may not be urgent — but it’s rarely meaningless.

In your cannabis grow journal, log the location, growth stage, and recent changes to nutrients or watering. Common causes include:

• Nitrogen Deficiency: Older leaves turn yellow as nitrogen is pulled toward new growth.


• Lack of Light: Leaves hidden from light naturally yellow and die. Consider defoliation.


• Overwatering: Leads to droopy, yellow leaves and root stress. Review watering logs.


• pH Imbalance: Even with pH-balanced water, soil drift can block nutrient uptake.

Track Growth Stages with Your Weed Growing App

PLNTRK automatically tracks each plant’s lifecycle, helping you forecast harvest windows. A typical grow might look like:

• Veg Stage Start: 2024-09-30


• Flower Start: 2024-11-11


• Estimated Harvest: 2025-01-13


• Drying: 2025-01-21


• Curing: 2025-02-04

During flowering, a few yellow leaves can be normal. But when logged consistently in your weed growing app, worsening symptoms may signal deeper issues.

CalMag Deficiency in Your Cannabis Grow Journal

If you're using pH-balanced water without added nutrients, especially with RO or soft water, you might see Calcium and Magnesium deficiencies. These are common entries in any experienced grower’s weed growing journal.

• Calcium Deficiency: Curling leaf tips, necrotic spotting, slowed development.


• Magnesium Deficiency: Yellowing between veins on older leaves (marbling effect).

Add CalMag as needed and monitor response over time in your cannabis grow journal. Early tracking can prevent costly damage mid-flower.

Testing and Fixing Soil pH

If your weed growing app shows repeated issues, test your soil pH:

1. Pull soil from multiple plant sites.


2. Mix with distilled water (for meters) or pH solution (for kits).


3. Record and compare pH readings across your grow.

Ideal soil pH for cannabis is 6.0–7.0. Outside this range?

• To raise pH: Use dolomite lime or small amounts of wood ash.


• To lower pH: Use elemental sulfur or acid-forming fertilizers.

Why Logging Every Detail Helps Weed Growers

The more consistently you log in your cannabis grow journal, the more patterns you’ll spot. From minor yellowing to full-blown CalMag issues, the best growers treat their logs like a blueprint — not just a notebook.

With PLNTRK’s weed growing app, you get more than storage. You get timelines, trends, and insight — all connected to your real plants in real time.

Final Thought

Yellow leaves might be a simple deficiency — or the first sign of a deeper imbalance. By tracking everything from symptoms to supplements in your weed growing journal, you gain the insight to adjust before it’s too late.

Start tracking smarter with PLNTRK — the weed growing app built for serious cultivators who care about every detail.

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