Day After Thanksgiving Greenhouse walkthrough

It’s a beautiful sunny day here in Dillsburg, PA! It’s 34° outside and about 48° in the greenhouse at 8:37 am. Today we have three rafts of lettuce growing in the DWC – “Monte Carlo” and “Chalupa” romaine from Johnny’s Seeds.

The wicking bed has a square of beats. Two squares of kale and some carrots, collards and radishes. The media beds have 5 squares of collards that are growing well, two broccoli plants, a pepper plant, although it’s kind of late for that. I don’t know if it’s going to make it. I have about a dozen milkweed plants that I’m starting. It’s probably the wrong time of year for that, but, hopefully I can get them through till spring and I’ll have some nice milkweed plants to put out in the yard for the Monarch Butterflies. I’ve tried to root some Rosemary and lavender cuttings. The Sedum cuttings are doing great. Cut the stalks, stick then in some potting mix and they grow. The lavender and the Rosemary doesn’t look too good yet. I don’t know if it’s going to take root or not.

The fish tank water heaters read 71 degrees. We’ve got 69.6 degrees on the tank thermometer. Two of the three heaters are on and heating right now. So, It’s not bad, it’s little humid in here. I opened up the back vent and took the insulation off the front door vent and set the exhaust fan to come on at 85 degrees. The thermometer in the rocks of the East media bed reads 68°. So things are doing pretty good. It was a cold night. Spraying a little watering on the Rosemary and lavender cuttings. They don’t take much water, but you have to keep them moist. That’s it for today.

Wicking Bed Build at Mexico Aquaponics House

The Mexico City team has the Wicking Bed ready to plant seeds of hope and fresh food in the new community Aquaponics House! Thanks to Tracey, Luis, Jerry, and John. This is the first phase of the system build. (The second phase will be the Aquaponics grow bed and fish tanks on the roof!)

The Mexico City Team:
Tracey, Luis, Jerry, and John

The Wicking Bed is made from standard concrete blocks setup in two rows.

The bed is lined with food safe LDPE plastic, then insulated with 10mm (3/8”) Styrofoam (Polystyrene) on the bottom and sides. The Styrofoam protects the plastic liner and stabilizes the temperature. Water is added to the bed through a 100mm (4″) pipe along the bottom (drilled with holes) that is covered with volcanic rock (Red Tezontle) on both sides. The rock helps improve the water dispersion into the bottom of the bed and stabilizes the pipe.

Luis and Jerry add a 100mm (4″) layer of course horticultural vermiculite to cover the pipe. This creates the water reservoir. There is a 19mm ( ¾”) PVC pipe through the side to allow overflow if the water reservoir gets too full after rain.

A layer of shade cloth or geo textile cloth is placed on top of the vermiculite to keep it separate from the compost.

A 254mm (10”) layer of well-aged compost is added and then topped with a 50mm (2”) layer of straw mulch.

The top edge of the cement blocks will be left open. The excess plastic is tucked inside over the Styrofoam lining. The exposed holes can be filled with planting media and used to grow companion flowers that attract beneficial insects. Another option is to place Trellis posts on the northwest end in these holes for climbing plants like Cucumbers, or beans.

Row covers will be used to protect the plants from heavy rains or cold temperatures during winter.


John and Tracey Pieters are Christian missionaries with United World Mission in Mexico City, Mexico. Their vision is to create a complete Aquaponic System to bring people together, sharing labor, life stories, pure food, and the joy of knowing Jesus Christ.

You may support John & Tracey financially by clicking John & Tracey Pieters – United World Mission (uwm.org) or write a check to “United World Mission” and note your preference to “John & Tracey Pieters Support” (Account #27334).


Lettuce Harvest 30 June 2017

Happy 4th of July!

Several people have asked for a tour of my greenhouse, so here is a more detailed walk through during my Friday morning harvest. This video is posted on YouTube here: