Expel Turf Herbicide should only be applied to established lawns. You would need to wait one month to seed after an application or wait at least 30 days from seeding or after the area has been mowed twice to apply.
Expel Turf Herbicide should not be applied when temperatures exceed 85 degrees. Please be sure to review the product label for more information and complete application instructions. You should apply in the morning or later in the evening when temperatures are not above this.