1 A video produced by Washington DC's American Chemical Society reveals the science behind why dogs smell each other.2  It's revealed that they do this to find out information about other dogs. 3  Glands in a dog's behind secretes chemicals that can reveal key information.hare this article. Share. They found that on the rear-end of the dog is an area called the anal sac, which excretes identifying chemicals to other dogs. One of the glands here is the apocrine gland, which gives the dog its natural smell.
Valerian (Valeriana officinalis, Caprifoliaceae) is a perennial flowering plant, with heads of sweetly scented pink or white flowers that bloom in the summer. Valerian flower extracts were used as a perfume in the 16th century. Native to Europe and parts of Asia, valerian has been introduced into North America.The flowers are frequently visited by many fly species, especially hoverflies of the genus Eristalis.rude extract of valerian root is sold as a dietary supplement in the form of capsules. Valerian root may have sedative and anxiolytic effects. The amino acid valine is named after this plant.
Tropical marginal plants must continue to grow during the winter months. Growth will be reduced considerably as daylight hours diminish. Umbrella Palm, Dwarf Papyrus, Little Giant Papyrus and White Arum lilies will survive the winter indoors and make excellent houseplants.Other varieties are best treated as annuals.hile tropical marginal plants do require more work than their hardy cousins, they can add a spectacular splash of colour to your water garden, making them well worth the effort. Many of the tropical varieties listed here may be kept indoors as houseplants during the winter, while others should be treated as annuals.