Day 10: Fresh feed change meets active stress · Autoflower Cannabis in a LetPot: Air Gap and Droop Recovery

Visual evidence

What Dud2Bud observed

The plant is still growing, but posture has not improved and the new dark curl with tip burn makes excess nutrient strength more plausible than it was yesterday. The safest next test is dilution without adding another variable.

The plant remains upright at the stem.

Central growth is still present.

The canopy has not collapsed completely.

Leaves remain broadly drooped compared with the previous photo.

Several leaves are darker, curled, and claw-like.

Brown tip and edge damage is now visible on multiple leaves.

The recent 5 ml A/B addition introduced a plausible nutrient-strength change.

Active new damage

Brown tip and margin damage is visible on more than one current leaf.

Active new damage

Leaf curl and downward posture remain active after the prior check-in.

Active new damage

The current symptoms followed a reservoir top-up and nutrient addition, although exact timing and dosage concentration are uncertain.

Old damage

The original isolated lower-leaf damage is not treated as the main issue.

Old damage

The plant's earlier stem stretch is secondary to the current leaf curl and tip damage.

Still uncertain

Reservoir volume, EC, pH, and waterline are not visible.

Still uncertain

The photo lighting differs from the previous photo, so color comparison is imperfect.

Still uncertain

Root appearance and aeration remain unknown.

Dud2Bud decision

Undo the recent nutrient increase

A recent A/B addition coincides with dark curl and tip burn. Diluting the reservoir is reversible and avoids stacking another nutrient dose onto a stressed root zone.

What to do

Dilute the reservoir - no more A/B today

Replace part of the current reservoir solution with plain water, using a conservative partial dilution, then leave the nutrient level unchanged for the next 24 hours.

1 Remove roughly one-third of the current reservoir solution.
2 Replace that volume with plain water suitable for the system.
3 Do not add additional A/B nutrients for the next 24 hours; do not try to repair already-browned tips.

Exact change

Remove and replace about one-third of the reservoir solution with plain water, then add no more A/B nutrients for 24 hours.

Keep steady

Keep the waterline and light schedule steady after dilution. Do not add more nutrients, pH adjusters, or other supplements during the 24-hour test.

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Full assessment

How this photo was assessed

The report separates visible facts, possible explanations and the final care decision so uncertainty remains visible.

Visible evidence What was visible in the photo

Vigor

Concern

Vigor is currently limited even though the plant has not collapsed.

Confidence: 84%

Color Analysis

Concern

Dark foliage plus tip burn is compatible with excessive nutrient strength, though root-zone stress can produce similar uptake problems.

Confidence: 78%

Growth Development

Improving

Development is continuing, but current leaf quality and posture indicate that growth is under stress.

Confidence: 73%

Progress Comparison

Concern

The previous root-zone hypothesis was not fairly verified because the recommended adjustment was not performed, but the unplanned nutrient addition creates a new high-priority variable.

Confidence: 86%

Damage Classification

Active Problem

This is active physiological leaf stress, not just old cosmetic damage.

Confidence: 80%

Distribution Analysis

Active Problem

A whole-reservoir or whole-plant factor is more likely than a single damaged leaf.

Confidence: 80%

Possible mechanisms What could explain it

Disease

Watch

Disease cannot be ruled out because roots are hidden, but treatment for disease is not justified before correcting the recent nutrient change.

Confidence: 47%

Nutrition

Active Problem

Nutrient strength may now be too high for the reservoir volume or current root condition. The correct test is dilution, not more feed.

Confidence: 70%

Environment

Watch

Environmental demand may contribute, but changing the light now would confound the more immediate nutrient-strength test.

Confidence: 52%

Biotic Damage

Clear

Pests are not the leading explanation.

Confidence: 75%

Water Relations

Active Problem

Water access and oxygen balance remain relevant, but the new nutrient addition makes nutrient strength the cleaner single variable to change first.

Confidence: 62%

Structural Analysis

Watch

There is no clear mechanical failure; the posture is more consistent with physiological stress.

Confidence: 65%

Decision checks Why this action was chosen

Recovery

Concern

Recovery is not established. The plant needs a controlled corrective step.

Confidence: 84%

Information Gap

Watch

More measurements would refine the next step, but they should not delay a low-risk reduction in nutrient concentration.

Confidence: 76%

Limiting Factor

Active Problem

Excess nutrient strength is currently the leading controllable limitation, with root-zone oxygen and water level still important background factors.

Confidence: 69%

Confidence Audit

Watch

Confidence is moderate for nutrient dilution, but low for assigning a precise target EC or declaring root health.

Confidence: 78%

Intervention Evaluation

Active Problem

The previous experiment is not a failed verification. The new feed change must be treated as a separate experimental factor.

Confidence: 90%

Case reasoning

Cases tracked in this report

Intervening

Water access / oxygen balance stress

72% confidence

Latest intervention: No reservoir-level correction was performed. The reservoir was topped up and 5 ml of each A/B nutrient was added instead.

What comes next: Dilute nutrient strength without adding more A/B, then compare new growth and posture after 24 hours.

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This supporting report documents the visual evidence and care decision from one point in a longer plant journey. It is not indexed separately from the main plant story.