Slow Bolt Arugula is simple to grow and quick sprouting as a microgreen. It's a favorite and generally considered a staple of the spicier side of micro greens and baby salad greens. The peppery taste gets less intense as it grows bigger.
Arugula and Cress are both gelatinous seeds which mean they should not undergo the initial soak when sprouting. This will cause them to turn into a huge gelatinous mess which will never sprout, just as you described. Since they are in this mix, we have included a much smaller amount of these two seeds to offset the gel that they form. An initial soak of the entire mix for about 4 hours should do. After this point you can try to sprout them in a mason jar or Easy Sprouter but there are more efficient ways that we recommend.
You’ll need a medium, such as soil, hemp bag, unbleached heavy-duty paper towel, unglazed clay pot bottom, an unbleached coffee filter, or Baby Blanket.
Here are the directions for growing arugula, or any other gelatinous seed such as cress, chia, basil, or flax:
Sprinkle your seeds onto the growing medium. Leave enough space so that most of the seeds aren't touching.
Spritz the seeds with water. They should be damp, but not too wet.
Loosely cover the seed with clear plastic, so they don't dry out. (Plastic wrap or a clear produce bag work for this.)
Spritz the seeds twice a day, or as needed. Try to keep them damp, but not wet.
Once seeds are stuck together and to the growing surface, pour water in to rinse and pour out extra water.
Harvest with scissors when they reach the desired height.
Using the above method, you should be able to grow a 4-12 day sprout or microgreen. If you want to grow longer, you may have to use soil or a fertilizer such as liquid kelp.
Sprouting arugula seeds is easy if you know what you're doing. These microgreens grow quickly and only require about one-quarter-inch soil. After eight to nine days, they depend on the nutrients in the soil to get growing. You can place a grow lamp under your seedlings if you don't own any garden lights. You'll need to make sure to water them regularly while they're sprouting.
Remove the outer leaves before you start sprouting arugula seed. The seed stalks, also known as a cotyledon, are just beginning to emerge out of the soil. Cut off these leaves and place them on a flat surface, about half an inch above the soil line. Don't wash the seeds - they're very delicate! Spread them evenly in the soil. Once the sprouts have appeared, you can thin them to 6 inches apart and eat the baby greens.
Gather the leaves and place them on a piece landscape fabric or row cover to harvest the arugula seedlings. They should be kept dry and protected from rain for at least six months. When the soil is warm enough to sprout the seedlings, scatter the seeds lightly on top of the soil. A few days later, the seedlings will appear, and you can eat them right away! These sprouts can also be stored and used in your kitchen.