Rather than going full-out and spraying your entire crop with an untested product you just got from the internet, perform a test on one single leaf first. Wait for a day to see whether the application caused any damage before moving forward with a full feeding regimen. Spraying the buds can be bad for a number of reasons. Depending on your spray solution, this can lead to anything from a spoilt taste to an increased chance for mouldy buds. If you grow outdoors, buds getting wet can be a normal occurrence due to rainy weather.
If a spray with some type of fungicide is the only way to save your precious outdoor crops from a mould infestation, use a natural, safe, and residue-free product only. Some commercial sprays may be safer to use than others, but you should always follow the guidelines for safe use. You obviously don’t want to spray potentially harmful substances without adequate protection such as gloves, a face mask, and protective eye gear. Make particular note of how safe the product is to spray on something that you will consume after harvest. Some commercial insecticides or fungicides may work great for ornamental plants, but they can be harmful if not outright toxic for vegetables and of course, for your precious weed! So always read and follow the instructions carefully before you spray. There are two main types of sprayers available that you can use for foliar sprays; both types are useful depending on the circumstances. One type is a simple hand-sprayer that may take 500ml to 1l of spray solution.
These small and handy sprayers are great if you only have a few plants or if you require a sprayer for some “precision work;” for instance, when you want to avoid spraying buds. The other types of sprayers are garden pump sprayers. These come with different capacities and a shoulder strap so you can carry them around easily while attending to your plants. These pump sprayers also come with an extended spray wand which makes them especially convenient so you can spray your plants easily from all sides, including the underside of the leaves where it counts. The best is when you get both types of sprayers so you have them handy when you need them. There will always be times where the bigger pump sprayer will be better to use and then there are situations where you want the small hand-sprayer instead. By foliar spraying your cannabis plants, you can effectively combat all sorts of problems like pests and mould. It also an excellent way to provide plants with nutrients or stimulants in emergency situations. With the tips in this article, foliar spraying your cannabis plants shouldn’t be a mystery any longer! It's inevitable that at some point, almost all cannabis cultivators will find themselves in the position of needing to apply a foliar spray of one kind or another to their plants. There are many potential reasons for this: you could be in need of a fungicide or an insecticide ; or maybe you want to fertilise , correct a nutrient deficiency or just give lacklustre plants a bit of a boost. Whatever the motive for spraying, we think it's worth doing the job properly, and there are some basic measures we should take every time to make sure we get the best possible results and avoid damaging our plants. We?ll deal with these ten fundamental points first, then go on to talk in a bit more depth about foliar application afterwards. Do spray in low light , if you?re growing indoors, the best time will be at the beginning or end of the dark period, before the lamps have fully warmed up. In outdoor cultivation, it?s best to spray early in the morning or otherwise late in the evening, rather than in full sunlight and during the hottest part of the day. This avoids any burning of the leaves due to the ?lens effect? produced when strong sunlight hits water droplets and magnifies. The ideal temperature for foliar application is around 20-24ºC . In hotter temperatures, the stomata are more likely to be closed, meaning they can?t absorb nutrients as effectively, while spraying in cool weather can create conditions that favour fungal growth , something we most certainly want to avoid. For this reason it?s always better to spray first thing in the morning and allow the plants to dry during the day, rather than applying at the end of the day, which can leave the plants soaking wet all night long in low temperatures. Don?t spray in rainy weather , in high wind or with the ventilation running. Rain will obviously wash away, or at best dilute your spray solution, thus reducing its effectiveness. Save your solution and wait for rain to pass before spraying. Windy conditions or powerful fans indoors will carry much of your spray mist away from the plants, meaning not only a waste of solution but more importantly, an ineffective application with incomplete coverage. In a light wind outdoors, stand upwind while spraying to minimise contact with the product and let the wind carry the mist towards the pants.
Always be aware of your surroundings and other people, pets, etc. Do spray the whole plant , paying particular attention to the undersides of the leaves , where the stomata are located. In addition to being able to take in nutrients via the stomata, plants are also able, to a lesser extent, to absorb through the epidermis on the upper side of the leaf as well as the stems and stalks. If you?re foliar feeding with fertilisers intended for application to the substrate, it?s always a good idea to start with by using 50% of the recommended dosage rate to avoid burning the foliage with excess nutrients. Always use accurate measuring tools, don?t try and guess the amounts! Do test on a single leaf before spraying the entire plant. It?s always a good idea to spot-test new and unfamiliar products to make sure it?s not going to have an adverse effect on the whole plant.
Simply apply to one leaf or a small area of the plant and wait, if there?s no damage after 24 hours then you?re probably safe to apply all over. As a general rule, avoid wetting the buds of our cannabis plants at any time during the flowering cycle, mould is far more likely to infect and damage the flowers as a consequence, not to mention the likelihood of traces of the product remaining in the finished buds. Outdoor growers, on the other hand need to be more realistic about spraying in flower, and in rainy climates the issue of getting the buds wet is rather academic. The plants will inevitably get soaked at some point, and often a grower?s only chance to save the crop is by spraying an organic, residue-free fungicide to try and prevent mould.