Mary Helen is an African variety of straight, terry velvets. The plant is compact with thick leaves, up to 90 centimeters in height. Blossoms are long from May to September. Flowers are large, lush-burry, pale green. The diameter of terry floretses 8-10 cm. Due to their unpretentiousness, perfectly grows on any drained soil, in flowerpots, containers, balcony boxes, curbs and keep well in shape (do not fall apart from rain and wind), tolerate a drop in temperature without affecting the beauty of their flowers. The seedlings are planted in the open ground after the end of spring frosts.
How to Grow Marigolds Marigolds are very low-maintenance once established, and they are notably pest-free. In fact, they are often used to keep pests away. Marigolds can bloom almost non-stop and will keep going all summer, until frost. To achieve that non-stop flowering, keep your marigolds deadheaded.
Light For the most flowers and the healthiest plants, plant your marigolds in full sun.
Soil Marigolds are not fussy. Any good garden soil (and a little water during dry spells) should keep them happy, as long as the soil is not too acidic. Keep the soil pH above about 6.0. They also don't need a soil that is particularly rich in organic matter and seem to grow better in a leaner soil.
Water When you first plant your marigold seeds or plants, make sure they get regular water. Don't leave them in dry soil for more than a couple of days. If it is particularly hot and sunny, water them every day. Once they have had a few weeks to establish a good root system, they will be more drought-tolerant, but they will still bloom best if given weekly water.
Temperature and Humidity Marigolds are some of the few garden flowers that are true annuals. Gardeners in all planting zones have to replant them every year. They tolerate a wide range of temperatures but can get powdery mildew in damp or humid summers. Planting in full sun and providing room for airflow will lessen this problem.