For example, fast-growing sunflower varieties such as ‘ProCut Red’ and ‘Ruby Eclipse’, bloom just 55 days after planting. In comparison, giant sunflower types like ‘Mammoth Grey Stripe’ can take 120 ...

As they grow, an inch of water every seven days until the soil is moist should be adequate. When the seeds are germinating they require even less water. If you want the sort of giant sunflowers that ...