We are far-famed manufacturer and supplier of Pure Neem Oil For Plants in Coimbatore, Tamil Nadu, India. Neem oil can be extracted from most parts of the tree, but the seeds hold the highest concentration of the insecticidal compound. Neem oil insecticide works as a systemic in many plants when applied as a soil drench. Once the product is in the plantâs vascular system, insects intake it during feeding. The compound causes insects to reduce or cease feeding.