(c) Day neutral plants (DNP): DNP flower without regard to the length of the night but typically flower earlier and more profusely under long daylight regimes.  Day neutral strawberries provide summer long harvesting (except during heat extremes).

Figure 2: Photoperiod and Flowering

Short day plants flower with uninterrupted long nights.
Long day plants flower with short nights or interrupted long nights
(Left side: Short day plants flower with uninterrupted long nights. Right side: Long-day plants flower with short nights or interrupted long nights.)

2. Temperature: Temperature is a crucial factor that has an influence on the growth of plants. Temperature of the surrounding atmosphere and the temperature of the soil play an important role. For many of the plant processes like photosynthesis, respiration, germination and flowering, optimum temperature is one of the pre-requisites. Usually cold-season plants have 12.7 – 18.3°C as the optimum temperature for germination whereas warm-season plants germinate at 18.3 – 23.8°C. The Temperature Comparison between Cool Season and Warm Season Vegetables is as shown in Table 2. The temperature range for optimum photosynthesis and respiration vary with individual requirements of the plants and also among the species of plants.