What are the best sunflowers to grow for cutting?
Ecological Requirements of Sunflower Temperature requirements: Sunflower is a relatively drought-resistant plant due to its strong and deep root system. As an annual and summer plant, it is grown in subtropical and temperate climatic zones (where the average temperature in July does not fall below 18-19 oC). The total temperature requirement during the vegetation period (80-130 days) is 2600-2850oC. During the germination period, 4-5 oC is required as a minimum, 8-10oC as a minimum and 12-14oC as an optimum for a proper emergence. Temperatures above 30oC during the development period inhibit growth, and above 40oC pollen is generally unable to germinate and fertilization is either weak or absent. It is not very sensitive to late spring frosts. Young plants are resistant to frost. Seedlings can survive in the cotyledon stage at -5oC. It grows better in sunny, warm places with an average monthly temperature of 25oC during the growing period. Water and soil demand: Sunflower can use 3