Week 28 was a week of steady hands and sharp eyes. Outdoor plants got watered, the hoop houses got a good weeding, and the wet wall cleaning wrapped up. But the real story this week came from the Dutch bucket area, where a season-long experiment with a new growing medium taught the team something worth sharing.
Seed Stock Production
Caring for Plants Across All Growing Environments
Routine care continued across all active growing locations this week. Outdoor plants were watered, the hoop houses were weeded, and the team completed the wet wall cleaning that keeps our evaporative cooling system running at full efficiency. Consistent, unglamorous work, and exactly what keeps the crop on track.
Nature handling watering duty one day for the team this week. Outdoor grow bags getting a drink during a summer rain.
Dutch Bucket Deep Dive: When the Medium Changes, Everything Changes
At the start of this season, the team made a deliberate decision to try something new in the Dutch bucket area inside the greenhouse: swapping out the usual perlite medium for a peat moss-based medium for our Dragon's Breath pepper plants. Due to this being our first season using this media, we were unsure how often the plants would need irrigation and so we knew we would have to watch the plants closely for changes.
Here's what happened and what we learned.
Starting Point: Dialing In Irrigation
Early in the season, the team started with three-minute irrigation cycles twice a day. After monitoring the buckets closely, it became clear that the peat moss was holding moisture significantly longer than perlite does, the medium simply wasn't drying down between cycles the way it use to.
Over the following two weeks, irrigation was gradually reduced until the plants were receiving one two-minute cycle per day. Problem solved, for a while.
Mid-Season Shift: The Plants Started Talking
As greenhouse temperatures and humidity climbed and the Dragon's Breath plants developed larger root systems, something changed. The team started noticing chlorosis, yellowing leaves, and deformities in the newest growth.
The instinct might be to reach for more fertilizer.
While these symptoms can have several causes, environmental conditions likely played a significant role. High temperatures combined with high humidity can reduce transpiration, which limits the movement of certain nutrients, particularly calcium and boron, through the plant, resulting in deficiency-like symptoms even when nutrients are present in the root zone.
The issue appeared to be environmental rather than a lack of fertilizer, increasing the nutrient solution EC was not our first approach. Under these conditions, raising the EC can increase salt levels around the roots without resolving the underlying cause.
Instead, we increased irrigation frequency to better match the plants’ increased water demand as temperatures rose and the root systems expanded, changing from one two-minute irrigation per day to multiple four-minute irrigation events throughout the day.
Chlorosis on a Dragon's Breath plant in the Dutch bucket area, the symptom that prompted a closer look at irrigation frequency and environmental stress.
Where Things Stand
Since making these adjustments, the plants have developed a slightly darker green color, suggesting improved nutrient availability. Although some chlorosis remains, the overall plant appearance has begun to improve, indicating that the changes to irrigation are helping reduce environmental stress.
For Home Growers
If you're running a Dutch bucket or any drip-fed system and start seeing yellowing or deformed new growth during a heat stretch, don't assume it's a fertilizer problem. Ask yourself:
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- Has the temperature or humidity changed significantly?
- Is my medium drying down the way it should between waterings?
Sometimes the fix isn't more nutrients, it's more water at the right times.
The Dutch bucket area inside the greenhouse with the Dragon's Breath pepper plants growing.
Looking Ahead
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- Continue monitoring Dutch bucket Dragon's Breath plants for continued improvement in color and new growth
- Maintain wet wall treatment schedule (hydrogen peroxide additions Monday and Thursday)
- Monitor fruit development across isolation rooms, hoop houses, and grow bags
- Continue routine care across all growing environments
What This Means for Home Growers
Growing medium matters more than most people realize and it doesn't behave the same way in every environment or every season. What worked in week one may need to be adjusted by week ten. The best growers aren't the ones who set it and forget it. They're the ones who keep watching.
Need more growing guidance? Visit our full library at Grow with Joe or send us a message, we're happy to help.
Keep Up with the Greenhouse
Missed last week? Week 27
Want to see how the season started? Start at Week 1
Stay spicy. Until next week, keep growing.
🌶️ The Pepper Joe's Growing Team