Soil, Inc : this is a company run by family members with base in Colorado. This company makes a product called Planters II. One thing to consider is that this is not a natural product because it is made of chemical derivatives. However, they claim it is natural because the levels of chemicals are low and are not hazardous for plants. 4- When the leaves start to get a darker green tone or simply get black the plant does not have enough phosphorus. In this case you should try to find a natural plant food product for maize that contains phosphate in different forms. 5- If the leaves at the bottom of the plant have darker ends, and it does not grow, the plant does not have enough potassium. They also allow plants to make use of the substances they absorb for longer periods and they will not leak and erode the ground. Pellet plant food has very small quantities of inorganic substances and this makes it the perfect ally to condition your ground. This type of plant food is made of various ingredients such as fish coating, algae concentrates and other sea-related things. This is so because this type of plant food will augment the plants' natural saccharide amount that will then induce the intake of the added substances. In a recent research it was demonstrated how plant can improve their quality with the use of foliar plant food. It was also stated that leaves waste matter is a perfect ally to fight off illnesses and fungal infections. The majority of natural plant food products combine different natural ingredients, but some may only have one ingredient. Natural plant food products can fit four classes: flora, fauna, chemical and decayed natural waste matter. - Flora plant food: this kind of plant food has an important amount of substances with good storage levels. Advantages of fluid natural plant food One of the best things about this type of plant food is that it is not soluble in H2O and it will remain on the ground for longer periods if you water your plants on a daily basis. If you use inorganic fluid plant food you might get the same results but you will have to apply the product more often.