In Jainism, ahimsa (non-violence) is the guiding principle for all living beings. Because weeds are plants, a Jain who follows strict non-violence tends to minimize harm to them as well. So:

• Many Jains try to avoid unnecessary harm to plants and insects. When weeding, they may take care to reduce injury to small life forms and may prefer methods that limit harm.
• Some practitioners adopt practical farming practices to minimize injury, such as using mulch, careful pulling by hand, or methods that reduce disruption to soil life. Others may defer weed removal or use organic practices to lower overall harm.
• There is no single universal rule about weeding in Jainism; interpretations can differ slightly between Digambar and Śvetambar communities, but both emphasize non-violence and reverence for all life.

If you’d like, I can look for specific Jain texts or authoritative explanations on this topic from Jain sources.