Days to maturity is from seed germination for direct seeded crops and from transplant time for crops that traditionally transplanted. However, this determined by seed companies from averaged seed trials under controlled (and somewhat ideal) conditions. Normally, there is some variation from the stated maturity date. As long as plants are healthy, have not been shocked at transplant and have received the right amount of light, temperature, moisture and fertility, plants will grow to maturity within our growing season. On the plant signs at Red Wagon “days to maturity” indicates the number of days from transplanting to maturity. Seed catalogues also use the days from transplanting if it is a crop that is normally transplanted, such as tomatoes, peppers, or eggplants.