Wetting agents (surfactants) make water wetter. You don't need a wetting agent - just be sure you don't allow bark and peat-based soils to dry down too much. They start to become hydrophobic (water repellent) at around 30% moisture levels. If you really think you need one, do a search for "Coco-Wet" or "Agri 2". Al

Dishsoaps are a phytotoxic brew of ingredients, most if not all of which are poisonous to plants and should not be used on foliage, incorporated into grow media, or allowed to become a small fraction of the soil solution. The question isn't whether or not these harsh surfactants will cause damage, it's 'how much damage will they cause'. 'Dawn' contains at least 11 phytotoxic ingredients. Dishsoaps and other household cleaning products can destroy cuticular waxes in leaves, which compromises leaves' protective barrier against biotic pathogens and insect herbivory while also leaving the plant vulnerable to excessive water loss. Detergent solutions that make their way into the grow medium where they come in contact with root cells can quickly dissolve the lipid membrane surrounding cells, killing the cells and inhibiting water/ nutrient uptake. Hair cells growing as appendages off larger roots do the lion’s share of assimilating water and nutrients, and these very delicate cells would be the first casualty of any detergent in the root zone. When establishing new plantings with media containing dry bark/peat, measure out the volume of medium required to fill the pot. Put half of it in a bucket or tub, wet thoroughly, stir, add the dry fraction, mix well, wait 15 minutes. Water and free water vapor from the wet soil will quickly diffuse into the dry soil particles, 'breaking' any tendency of the dry particles toward hydrophobicity well within the span of 15 minutes, leaving the grower with a pot full of grow medium which is evenly moistened and ready to receive plants. Al

'Dawn' dish soap works great. I don't know how "natural" it is, but I figure, if it's safe enough to wash dishes in, it's safe enough to spray on plants. However, I always use the dust form of BT, with a 'Dustin' Mizer' dust applicator -- it is a really efficient way to do it, and the 'Dustin Mizer' makes a little go a long way.

I googled it: Yucca is a flowering plant in the Lilaceae family that grows mostly in desert areas of the United States and Mexico. It typically has stiff leaves with needle sharp ends. There are dozens of varieties, such as Spanish dagger and giant Yucca, which can range in sizes. They tolerate high temperatures and sparse watering but may be killed by cold. Yucca extract is a consumable product derived from these plants. The word âÂÂsoapâ is often used in conjunction with Yucca and Yucca extract. This is because the plant can be used to make soap products for both external and internal use. Native Americans are believed to have used Yucca extract and other parts of the plant for centuries. Modern usage is mainly limited to the roots. This is from where yucca extract, which is noted for its soapy texture, is normally produced. That extract was believed to have been widely used by the Native Americans for making soaps and shampoos. Even today, people can be found who use it for this purpose. When it is consumed, it can also act as a detergent for the digestive system. It is widely used to wash toxins from the intestines. Build up of toxins is believed to be the cause of many conditions such as arthritis, colitis, and migraines. These conditions are often alleviated as well. Since yucca extract is not a drug, it is typically classified as alternative medicine. There is not much reputable scientific support for its use. It does, however, contain many useful nutrients, such as iron, selenium, and vitamins A and B. Yucca extract may be recommended for the use of several medical conditions. One of the most popular uses is to lower cholesterol. This may be possible due to saponins, which act as antibiotics for plants. Saponins are believed to bind with bile, which encourages the liver to produce more. To do this, cholesterol must be removed from the blood, and since it is not reabsorbed into the body, the cholesterol is passed as waste. Many health food stores sell yucca extract. There are generally no side effects associated with consumption. It may be available in the form of tablets, capsules, or tea. Yucca extract is also used to control the smell of animal waste. This is possible because saponins bind to ammonia and prevent the smell from passing through the air. It is commonly found in food for cats and dogs. It may also be found in cat litter.