It turns out that pine needles make good mulch for tomatoes because they have a lot of nitrogen-fixing bacteria in them. When you use a bag of pine needles as mulch, the bacteria break down the nitrogen in the air and convert it into fertilizer that the plants can absorb.
Yes, but only if you’re careful to water them. The reason that pine needles are used to protect plants is that they contain a substance called resin. Resin attracts ants and other insects away from the plant and therefore keeps pests under control.
Is It OK To Put Pine Needles Around Tomato Plants?