Quick Harvest, Bottom Watering, Soil Based, Microgreen Grow Trays (Design 2, Version 3)
Seed to harvest in 1-2 weeks with most micro varieties

Designed my own trays based off the larger 10x10 grow trays which I previously used to grow in. These trays are smaller so they can be grown and harvested for individual meals, watered quickly without mold development and efficient usage of seeds and soil.

Advantages of this design over traditional grow trays:

• Small compact design
  • Minimum soil usage
  • Easier to water and harvest quickly
  • Suited for indoor growing & stackable
  • One tray typically yields enough greens for 2 sides
• Shallow depth + drainage holes for aeration and watering
  • Two different types of holes/slits to allow water to drain
  • Holes small enough to prevent root penetration
    • Root mass stays compacted, easier for clean up, composting and bottom watering
  • Low height, lots of drainage plus slanted sides allows bottom watering to penetrate all the soil and roots at once, drain uniformly and prevents most watering related mold growth

Tray prep is quick and easy:

• Soak seeds (optional but takes 2-3 days off germination & grow time)
• Fill micro-tray with enough soil to reach the brim or halfway to the brim (doesn't really matter how much soil you use, play around and find what works for you)
• Use another micro-tray to push down on the soil and compact it.
• Soak micro-tray (bottom water or just spray with water to get it wet)
• Spread seeds in an even layer on top of soil, not necessary to push down or cover. (seeds can overlap and can even be placed in two layers, important part is to have an even layer of seeds and ensure that all the soil is covered)
• Let micro-tray sit until tray weighs less or looks dry

Dont rely just on the dryness of the top of the soil to gauge moisture. Since there isn't that much soil once the top layer is dry its likely that the rest of the soil and root mass is dry as well.

After prepping trays with soil/seeds and allowing them to soak, make sure you weigh one to get a base estimate of the weight. You can then lift trays every few days to guage how much moisture is present/when you need to rewater them.

Watering is done with a 10x20 grow tray. Fill with 1" of water or enough to reach half way up the micro-trays, place trays in water and allow them to soak for 5-10 min depending on how compact the soil is and how much root mass is present.

Micro-trays can be washed in the dishwasher (depends on material, worked for most brands of PLA printed at 100% infill and all ABS brands tested)

For more techniques and help watch:
https://bit.ly/2IzSsBw
This started me on my microgreens journey years ago and had the best advice and tips for microgrowing in general!

Happy Harvesting!!!