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