The Psyche Gardens

[Observer]

Week 4: Transition to Flower (Generative Initiation)

Parameter	Target Value
Mist ON	1.5 sec
Mist OFF	5–6 min
EC	1.6–1.8
RH	65–70%
VPD	1.0–1.3 kPa
PPFD	Switch to 12/12, PPFD 500–700

Focus: Begin dryback cycles, slightly reduce humidity to steer into flowering.




Week 5–6: Early Flower (Generative)

Parameter	Target Value
Mist ON	1.0–1.5 sec
Mist OFF	6–8 min
EC	2.0–2.2
RH	60–65%
VPD	1.2–1.4 kPa
PPFD	12/12, PPFD 700–900

Focus: Maximize bud site development. Roots should show clear wet/dry cycles.

 

[Observer]

Week 7–8: Peak Flower (Generative Reinforcement)

Parameter	Target Value
Mist ON	1.0 sec
Mist OFF	8–10 min
EC	2.2–2.4
RH	55–60%
VPD	1.4–1.6 kPa
PPFD	12/12, PPFD 800–1000

Focus: High generative stress, high light, maximize trichome and cannabinoid production.





Week 9–10: Ripening

Parameter	Target Value
Mist ON	1.0 sec
Mist OFF	8–10 min
EC	0.2–0.4 (RO water or light flush)
RH	30–55%
VPD	1.5+ kPa
PPFD	12/12, optionally dim to 80%

Focus: Clean finish, enhance flavor and aroma profiles. Begin dryback cycles as you approach harvest.

 

[Zen_seeker]

Incorporate this idea…
View attachment 101361

I was picturing your setup sitting on top and the jets just above the first liner that has the mesh. Wouldn’t need the last divider insert.

So you’d have the water droplets from the spray nozzles but then a finer mist from the heat and natural convection.

IDK, just saw it as being a useful idea to your project.

 

[Zen_seeker]

...

Some of the roots are looking much better. Whites showing a lot more.

 

[Observer]

Some of the roots are looking much better. Whites showing a lot more.

Some better than others, surprised I'd not have more of an issue.

 

[Observer]

""High-Pressure"" Aeroponics Crop Steering Calendar

Week 1–3: Vegetative Stage

These parameters are basically right on the spot, from ChatGPT.

Parameter	Target Value
Mist ON	2 sec
Mist OFF	3–4 min
EC	1.2–1.4
pH	5.8–6.0
Canopy Temp	24–28°C
Root Temp	22–26°C
RH	70–75%
VPD	0.8–1.2 kPa
PPFD	18/6 or 20/4, PPFD 300–500

Focus: Explosive vegetative growth. Roots should stay consistently moist with little to no dryback.

Stage	Mist ON (sec)	Mist OFF (min)	EC (mS/cm)	RH (%)	VPD (kPa)	Root Temp (°C)	Canopy Temp (°C)	Light (PPFD µmol/m²/s)
Week 1–3: Vegetative	2.0	3.5	1.2–1.4	70–75	0.8–1.2	24	26	300–500
Week 4: Transition	1.5	5.5	1.6–1.8	65–70	1.0–1.3	23	25	500–700
Week 5–6: Early Flower	1.2	7.0	2.0–2.2	60–65	1.2–1.4	22	24	700–900
Week 7–8: Peak Flower	1.0	9.0	2.2–2.4	55–60	1.4–1.6	21	23	800–1000
Week 9–10: Ripening	1.0	10.0	0.2–0.4	50–55	1.5+	20	22	Dim to 80% or maintain as needed

 

[Observer]

...

 

[Observer]

...

 

[Observer]

Removed a few leafs blocking bud sites.

 

[Observer]

Foliar Spray Recipe (24oz / 710 mL)

Purpose: Light growth stimulator, anti-stress, and mineral mobilizer.

Ingredient	Function	Dose (per 24oz)
Soluble Kelp Powder	Hormonal boost (cytokinins, auxins)	~0.18 g (1/16 tsp or pinch)
Mr. Fulvic	Chelator + uptake enhancer	~0.7–1 mL (1/5 tsp)
Tween 20 (or Aloe)	Spreader/wetter (non-ionic)	0.5 mL (10–12 drops)
Clean Water	Carrier	Fill to 710 mL (24 oz)

 

[Observer]

Foliar Spray Schedule: Veg to Early Bloom

Stage	Frequency	Time of Day	Notes
Early Veg	2× per week (e.g., Mon/Thu)	15–30 min before lights on	Encourages strong root & leaf development
Late Veg	1–2× per week	Same as above	Watch for stretching; reduce if too vigorous
Early Flower	1× per week	Optional: spray on transition day (flip day) or Day 3–5	Use only if pistils are not fully formed
Mid Flower	Stop spraying	—	Foliar sprays discouraged—risk of mold
Late Flower	Avoid	—	Absolutely no sprays near harvest

 

[Observer]

14-Day Flower Entry Plan (Defoliation + Nutrients + Environment + Light)

Day	Defoliation	Nutrients / EC	Environment	Light (PPFD)	Notes
0	Minor defoliation done	EC: ~1.6–1.7	N:K ~1:2	Add a bit more K via K₂SO₄	77°F, 60% RH (VPD ~1.2)
1–3	No defoliation	Maintain EC; begin backing off N, increase K & micros	Slight dry-back period (HPA = shorter mist durations)	350–400	Stretch begins; observe internode spacing
4–6	Optional: prune new large leaves if blocking colas	EC: ~1.8	Add small Mg bump if leaves pale (Epsom)	RH: 58%, temps 78–80°F	400–450
7	Health check only	EC: 1.8–1.9	Steady Ca, Mg, K	Check root health under HPA	55–58% RH, ~80°F
8–10	No leaf removal unless airflow blocked	Optional kelp + fulvic foliar (light AM mist only)	RH drop to 55%, keep good airflow	500–550	Let tops form; reduce mist frequency
11–13	Evaluate again for shading	Begin ramp to flower ratio: less N, hold Ca steady, keep Mg/K climbing	Reduce misting duration if roots vigorous	52–55% RH	550–600
14	Prep for Day 21 defoliation	EC: 1.9–2.0	Final boost to P/K using K₂SO₄ and flower-leaning ratios	RH: ~50%, temp 78°F	600

 

[Observer]

Mid-Flower Crop Steering Plan (Day 21–42)

Day	Defoliation	Nutrients / EC	Environment	Light (PPFD)	Notes
21	Main defoliation: remove inner fans, shaded budlets, bottom 1/3 larf	EC: 2.0–2.1	Focus on K, P, Ca — reduce N to ~80% of early flower level	RH: 48–50%, 78°F	600–650
22–24	Let plants recover	Maintain ratios; ensure CaNO₃ is still present to prevent blossom-end rot (especially in fast growers)	Dry-back periods slightly longer (less frequent HPA pulses)	RH: 48%, light breeze	650–700
25–28	No more defoliation unless airflow issues	EC: 2.1–2.2	Add K₂SO₄ + MgSO₄ if seeing any leaf edge curling or pale buds	Lower RH: 45–48%	700
29–31	Optional: leaf thinning only if stacking is too dense	Keep feeding P/K heavier; reduce N to 60–70% of max	Maintain VPD ~1.3–1.5 kPa	720–750	Smell and resin should pick up
32–35	No defoliation; let plant fill	EC 2.2–2.3 (max)	Lower RH 42–45%, temp ~77°F	750–800	Peak bulking, pistils darkening begins
36–42	Light leaf pull if needed	Begin stabilizing formula (maintain, don't climb EC)	Maintain RH <45%, increase airflow	800+ PPFD if no bleaching	Resin thickens, density increases

 

[Observer]

...

 

[Observer]

Dynamic HPA Steering Table (Flower Weeks 1–6)

Stage	Canopy VPD	Target Root Feel	ON Time	Suggested OFF Time	Trigger to Adjust OFF Time
Early Flower(Days 0–10)	1.2–1.4 kPa	Slightly moist	2s	2:15–2:30	Roots still wet after OFF time? Increase by +10s
Stretch Phase(Days 11–20)	1.3–1.5 kPa	Damp, not dripping	2s	2:30–2:40	Root zone too cool/wet = increase OFF time
Mid Flower(Days 21–35)	1.4–1.6 kPa	Touch-dry at end of OFF	2s	2:40–3:00	Roots drying too fast? Decrease OFF by 10–15s
Late Flower(Days 36–50)	1.5+ kPa	Cool & almost dry	2s	3:00–3:15	Leaf edges curling = possible underfeeding or dry-back too long

 

[Observer]

I was picturing your setup sitting on top and the jets just above the first liner that has the mesh. Wouldn’t need the last divider insert.

So you’d have the water droplets from the spray nozzles but then a finer mist from the heat and natural convection.

IDK, just saw it as being a useful idea to your project.

interesting, been thinking about it

 

[Observer]

 

[Observer]

.

 

[Observer]

...

 

[GrumpAzz]

Run me through your process.. what's the plan here?

 

[Observer]

Run me through your process.. what's the plan here?

Well it first started as a 4 site aeroponic tote, some died and ended up adding more holes and started more seeds, wanted to let them catch up but didn't have much time, and the big one is gonna get too big, so I went ahead to flower.

High pressure aeroponics.
The roots get misted by water droplets that are 10-50um/micron diameter.

All though mine is currently probably 30-70um, so need to make some adjustments/upgrades to get a consistent smaller average droplet size.

The goal is to get trichoblast root morphology, while maximizing avaiable oxygen to the root system.
those tiny fuzzy roothairs, they are a fuck ton more efficient at nutrient and water uptake.


And I'm also attempting some crop steering, going into Generative, the roots will get more time to dry and won't be as wet before the next misting cycle, currently 2s on, 2 minutes and 15 seconds off, which will increase or decrease by +/- 5-15s,based off root feedback.

As I'm going in to flower we want to promote a Generative Growth pattern, more E.C less water, etc.


Pic below is what HPA roots should look like.

 

[Observer]

Run me through your process.. what's the plan here?

Learning HPA

 

[Observer]

Ok so don't spray ur aerochamber/roots with 3% peroxide.....might of killed some of them or almost.... they not very happy now lol.


The right side corner was a male, chopped and replaced.

 

[Observer]

They should be okay, lol.

Light is dimmed while they rerecover.

I really thought 3% would of been diluted enough as I was using 35% before.....

 

[Observer]

A little too much oxidative stress.

 

[Observer]

Hehe

 

[Observer]

11hrs on/13hrs off
400-500ppfd
75/82f
60/75 RH
300-400 ppm 9-10-28 +mag sulfate + pot sulfate, calcium hypochlorous acid 2ml /gallon
5.5-5.9 pH

 

[Observer]

Removed a few more fan leafs blocking the other plants/bud sites.


Seeing how they handle ~600ppfd

 

[Observer]

Roots are meh looking, but the plants look ok.

Can't wait to try it again and do better next time.

 

[Observer]

Decent node spacing, was trying to keep em tight.

 

[Observer]

.

 

[Observer]

.

 

[Observer]

Scrubbed the tote and nozzles, flushed the pump and water line.

Removed a few more big leafs shadowing sites...

Kelp and fulvic foliar before lights on

Littles ones did not like the 650 ppfd, to be expected...cruising back down to 500 at top of the big one.

 

[Observer]

She purdy

 

[Observer]

Night night

 

[Bandit420]

Night night

The mainline job gonna be a mother or are you just fucking around and finding out about mainlining with an experiment?

 

[Zen_seeker]

.

Things seem slow, just not taking off. Something is holding back the explosive root growth you’re looking for.

 

[Zen_seeker]

They should be okay, lol.

Light is dimmed while they rerecover.

I really thought 3% would of been diluted enough as I was using 35% before.....

 

[Observer]

Things seem slow, just not taking off. Something is holding back the explosive root growth you’re looking for.

Definitely agree, starting to lean towards root zone temperature and the nozzles not working as they should/ average dropletsize.

The canopy is getting up to 82f, I figure the chamber is probably 75-80 if I leave the door shut, been leaving it cracked now.

 

[Observer]

IThe mainline job gonna be a mother or are you just fucking around and finding out about mainlining with an experiment?

I like to train and give the plants structure for yield and sturdier stems.

I sometimes mainline if I have the time.

Some of my first soil "mainlines"