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The onion is sprouting or trying to grow, if it were placed in the soil it would develop roots as well
No. They are a bushy vine like plant. You can grow your own with a potato that is sprouting and putting half of it in water. It will grow roots and the plant will grow out of the top half.
to increase light exposure
The roots.
roots
This dream brings to mind the popular saying, "Grow where you are planted." This dream suggests that you are ready to put down roots and begin to blossom right where you are now.
It is important for the roots of desert plants to grow near the surface of the ground so the desert plant's roots may get water easily ( without going into many kinds of trouble ).
water, sun and oxygen
Collateral Sprouting
Roots absorb water and other nutrients to make food by the germinating seedling to establish itself. They also act as anchor in the soil to keep it attached in the soil.
potatoes arent usually grown from seed but from potato cuttings.
roots and a stem