How to Grow an Onion in a Jar


Although an onion usually requires soil to produce another onion, you can grow an onion plant with nothing more than a jar and a little water. This method of growing plants in water is known as hydroponics. It is a fun experiment to try during the winter when it is too cold for planting outdoors, and the shoots that sprout from the onion are edible as well.

  • Select a firm onion that has a good root system. The root system or nib of the onion is located on the bottom of the onion.

  • Fill an empty pickle or Mason jar three-fourths full with water.

  • Stick one toothpick into each side of the onion. Insert each toothpick 1 inch into the middle part of the onion. The toothpicks hold the upper part of the onion out of the water.

  • Put the onion bottom into the water with the toothpicks resting on the edge of the jar. Place the jar in a warm location near a window where it receives indirect sunlight. Shoots from the top of the onion will appear in approximately five to seven days.

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