Pollinate Flowers

If you are growing fruits (e.g. tomato), you should pollinate the flowers for fruit production.

Some fruits like tomatoes, peppers or eggplants are self-pollinators, you can pollinate the flower simply by hand. Touch the flower and let it shake and then the pollen will spread and pollenate other flowers.
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You can also pollinate the flower with a soft brush (like makeup brush, paint brush or cotton bud), gently collect pollen from outside of flowers (male stamens) and transfer it to center (female pistil).