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Stealth Micro Cabinet Runtz - Eternity Grow Cup 2025
We’re kicking off a new grow in the stealthy growing cabinet! This time, I’m growing Runtz from Zamnesia for the Eternity Grow Cup—excited to see how this run turns out!
I’ve prepared the growing substrate using 4 litres of Plagron Lightmix as a base, enriched with nutrients from BioTabs:
✅ 25 g Startrex
✅ 5 g Mycotrex
✅ 1 BioTab
After mixing everything, I watered the substrate with 0.5 L of water containing:
💧 1 tsp per L of Bactrex
💧 5 ml per L of Orgatrex
The seed was sown a few millimeters under the soil, and to keep conditions ideal, I placed a small humidity dome to maintain high humidity levels. Now, it's time to wait and let nature do its thing!
The first week for the little Runtz has passed, and she has successfully developed her first set of true leaves! Exciting to see her settling in.
I'm growing this run 12-12 from seed to maintain a perpetual growing system in my cabinet. However, during the first phase of their life, seedlings aren’t sensitive to photoperiod yet, so they will only focus on vegetative growth for now.
At this stage, I’m only adding water, letting the slow-release fertilizers from BioTabs do their work in the soil. The setup is simple, but everything is looking great so far! On to the next week.
Week 2 is in the books, and the Runtz girl is growing strong! She put on a lot of growth this week—clearly loving the conditions.
I focused on keeping the climate optimal for seedlings, with a relatively high humidity between 60–70% and a nice warm environment to support healthy early development.
Not much else to do at this stage—just making sure she’s happy and hydrated, and watching her thrive.
Week 3 and things are ramping up! The Runtz is putting on more vegetative biomass, with her leaf size doubling and the growth rate picking up rapidly. She's clearly finding her rhythm now. I expect she’ll start showing signs of flowering soon, as we’re running 12-12 from seed. But for now, it’s still all about strong vegetative growth. Still no need to feed—the organic slow-release nutrients and soil life are doing their thing beautifully. It's always satisfying to see how well this natural approach works. Also added a little shot of the growing cabinet she is in - sharing the space with a Laughing Buddha and a soon-to-germinate Red Hot Cookies.
Another spectacular week of vegetative growth for Runtz—she’s really picking up speed now and growing fast! She’s getting super bushy, so I’ve started to remove some of the fan leaves to improve airflow and light penetration to the lower growth. Other than that, nothing major to report—just smooth sailing and steady growth. See you next week!
Flowering has officially begun! This marks the first week of bloom for Runtz, and she’s starting to show those lovely flower sites while going through a bit of a flowering stretch. She’s looking healthy and vibrant, full of energy and ready to focus on developing those big, sweet flowers we’re all waiting for. Climate has been stable this week—nothing strange to report. RH at night is still around 70%, but over the coming weeks I’ll be working on bringing that down to help prevent any risk of botrytis as buds develop.
As requested, I’ve included some pictures of my small, stealthy growing cabinet! In the pics you’ll spot:
- The current grow light (upgrade coming soon!)
- Fans for solid air movement
- A humidifier to help keep the VPD in check
- In the top part: the exhaust fan + carbon filter combo, insulated with foam and equipped with a silencer to reduce noise
Plant_Scientist
