The quick answer
Handpick them off in the morning or evening. Look for chewed leaves and dark droppings to find them. Leave any with white cocoons — those are being handled by nature.
What to Do About Tomato Hornworms
The quick answer
Hornworms are big green caterpillars that can strip a plant fast. The most reliable fix in a home patch is to pick them off by hand and drop them in soapy water.
Finding them
They blend in. Look for chewed leaves and small dark droppings, then work your way up the stem.
Leave the ones with cocoons
If you find a hornworm covered in little white rice-like cocoons, leave it be — those are parasitic wasps doing your work for you.
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