Indoor plants are generally easier to care for than some outdoor plants. They’re also a good choice if you live in temperate climates with little or no yard space to develop an outdoor garden. When choosing an indoor plant, however, there are some key qualities to consider and that also applies to when selecting a liquid fertilizer for indoor plants. For indoor plants, certain fertilizers will work better than others.
The first thing to know is whether your indoor plants should be hydroponic or soil-based. If your houseplant needs a lot of water, you should use a houseplant fertilizer that contains both magnesium sulfate and calcium sulfate. Both products will help keep the roots well-hydrated and healthy. If your plants don’t need as much water, then a houseplant fertilizer containing iron phosphate is recommended. This type of indoor plant fertilizer works by keeping the roots from burning themselves out.
There are also two types of houseplant fertilizers – nitrogen based and plant nutrients. Nitrogen-based fertilizers provide your plants with the vitamins and trace minerals they need to grow, while plant nutrients work as organic fertilizers. These types of fertilizers can be applied directly to the soil, mixed into a medium to soak up rainwater, or applied directly to your plants through a specially designed watering device. Most nitrogen-based fertilizers are available at garden stores as small packets of powder, granules, or ready to apply powder that you mix with your water. Both types of fertilizers are generally inexpensive and are available at many gardening stores.
Many indoor plants rely on the natural fertilizer, which comes in the form of fish emulsion mixed with soil. This type of fertilizer contains high levels of phosphorous, sulfur, and copper, all of which are necessary for healthy root growth. Although it is a slow-release, plant fertilizer, coffee grounds are still an excellent choice because they provide plant nutrients that are hard to match. They’re also easier on your lawn than natural compost or alfalfa compost.
When using phosphorous-based fertilizers, especially those with a sharp on, keep this in mind. Phosphorus burns, especially if the water has not been filtered first. For this reason, you should only use these fertilizers around plants that have already developed strong root systems. It can also make sense to dilute the amount you use with water to ensure that your lawn doesn’t take the loss because of it.
Some liquid fertilizers contain molybdenum. Molybdenum is a by-product of processing sugarcane into diesel fuel; it provides the nutrients needed to keep plants growing. However, molybdenum also causes burning in some plants, so keep this in mind before using it. If you use it, make sure to dilute it as well.
Organic fertilizers are generally made from living organic material like sea kelp, alfalfa, grasses, weeds, and clover. It works great for growing outdoor plants, but can actually be toxic to many types of outdoor plants, especially those that are vulnerable to pesticides. If you want to know how to fertilize indoor plants, stay away from organics unless you plan to make your own mix from scratch.
A popular way to make your own homemade fertilizer is to make a seaweed mixture. This mixture is best suited for plants that don’t need a lot of water or a lot of sunlight, like undergravel, sago palms, and other types of submerged plants. However, if you’re looking for a good all-purpose fertilizer that’s rich in nutrients and yet not too expensive, try Commercial Grade seaweed. Buy the full version at a garden store, and mix it together with a fertilizer suitable for your plants (calcium for new growth, iron for mature plants, etc). This is one of the best fertilizers on the market, and it costs just pennies on the dollar compared with most store-bought products.