There are no bugs on the underside of any of the leaves or living in the curled Folds of the leaves. The flowers that make up the head are divided into two groups. These disc florets will mature into what we commonly call the sunflower seed. I always try and give the sunflowers I cut from my garden, to display in my home a good start to help them last as long as possible. Choose a sunflower that is starting to open up or nearly bloomed The excess minerals can build up. The outer flowers are called ray florets, while the inner flowers of the circular center are known as disc (disk) florets. Severely diseased leaves yellow, dry up, and die. Why do some begonia leaves curl up? Help answer a question about false sunflower leaves turn yellow and curl up - Gardening Know How Questions & Answers. The lowest leaves are dead, and the next 3 tiers of leaves are affected. My Sunflowers Are Growing With Brown Spots on Their Leaves. Curling could be due to over watering (in lower temps the plants likely won’t need as much water). Sunflower beetle; Sudden death of plants (sunflower and weeds) in the affected circular area (50 to 100 feet in diameter). It is made up of many flowers tightly packed together. The sunflower on the far right has recently, within the past 2 or 3 weeks, had some very oddly shaped upper leaves. Water the sunflower plants regularly and deeply during times of active growth, or at least 20 days before and after they flower. Heliopsis 'Loraine Sunshine" is a short cultivar with rather unusual variegated leaves that curl up. Lightning; Brown pustules on lower leaves and sometimes stems later in the season. Cutting Your Own Sunflowers. The intensity of disease ranges from 2 to 100%. It has single flowers, a long bloom time and it is attractive to bees just like the native species. This could explain the indoor plants curling – try moving the light further away. Verticillium on sunflower leaf Verticillium is caused by a soil-borne fungus Verticillium dahliae.The fungus has a wide range of host plants. However, on younger sunflower plants, the first true leaves can be severely damaged or completely consumed. Sunflowers (Helianthus annuus) are annual garden plants that bloom during the summer … She suggested irrigating morning and possibly afternoon, as long as the leaves don't get wet, to avoid moisture at night. The disease greatly reduces the growth and seed yield. Also, help answer other questions about General Gardening and False Sunflower Plants, and plants at if your local tap water is on the hard side. HOW TO GROW SUNFLOWERS AND TAKE CARE OF THEM . Where: Although they can be planted in thin soils, show your sunflowers some love and plant in rich, loose, free draining conditions.Sunflowers are greedy, so ensure soil is nutrient-rich with composted manure. Its flowers are smaller than other cultivars, but it works well in rock gardens or low island beds where it can take the heat. The nursery worker suggested that the evening irrigation was creating humidity, as the water 'steams up' from the heat of the day. If cared for properly, cut sunflowers can last up to 2 weeks. Here are some great tips to care for cut sunflowers. Stalks often have a brown to black pith. When: Sow when the soil feels warm – anytime from now until May. Sunflower Beetles – Sunflower beetles typically feed on the leaf foliage and in small numbers or older plants may seldom hurt the plants. Curling leaves are often a symptom of under watering and/or too much mineral salts in the soil. They also grow best when … All the growth and yield parameters were significantly affected due to sunflower necrosis disease (SND) resulting in yield loss of 89% under severe conditions of 50-75% disease severity, 63% and 20% at 11-50% and 5-10% disease severity levels respectively. Vert, as it is most commonly called, initially infects the lower leaves which show easily defined symptoms (see picture). Curling can also be caused by too much light, as the leaves will try to protect the plant by curling up.