Are your microgreens ready to be harvested?
When Do I Harvest?
If they are, don't keep them growing in your trays. It is important to know when to harvest your microgreens. Keeping them growing well after their ideal harvest period will only reduce their flavour and even taste fibrous. Microgreens should be eaten raw so harvesting them at the right time is important, not only for their flavour but also to ensure that you get the right amount of nutrients with each growth.
In Singapore, most microgreens grow quite quickly - within 4-7 days - after the germination period. This is especially true of seeds like Arugula/Rocket, Pak Choi, Kale, Broccoli, Radish, Sunflower, Mustard, Cabbage, Turnip, and Cress. In our hot and often humid climate, microgreens grow a lot faster.
How Do I Harvest?
For the home grower, the easiest way to harvest your microgreens is to use a pair of sharp scissors. Make sure they are washed because you don't want any contamination on your crop. To harvest, simply grab a small bunch with your hand and snip off about half an inch to an inch above the medium. If you are using a soil medium, make sure you inspect the undersides of the stems for any clinging soil. Don't rinse your harvest, unless you must wash off any clinging soil.
There is no best time to harvest microgreens, in my opinion. I harvest my microgreens whenever I need them but I do ensure that they are dry. In other words, if I know I need to harvest my microgreens in the evening, I'll make sure I only water them in the morning so they are dry by the time I harvest them in the evening.
Where Do I Store Microgreens?
If you are planning to only serve your microgreens later, refrigerate them in an airtight container. Always store them dry. If your microgreens are wet, lay them out on a dry kitchen towel and place them under a fan to dry them before storing them in the fridge. If stored wet, the moisture in the microgreens will cause it to rot. Stored correctly, your microgreens will last for at least a week in the refrigerator.