Fimming and topping are two techniques that can help you improve the yield and shape of your autoflowering cannabis plants. However, they are not suitable for all strains and situations. Here is a brief comparison of the pros and cons of each method. Fimming is when you cut off about 75% of the main stem's tip, leaving a small part intact. This stimulates the plant to produce four new main colas instead of one, creating a bushier and more compact structure. Fimming is less stressful than topping, but it also takes longer for the plant to recover and resume vertical growth. Topping is when you completely remove the main stem's tip, allowing two side branches to become the new main colas. Topping can help you control the height of your plant and create a more even canopy. However, topping is more stressful than fimming and can slow down the growth of your plant significantly. Both fimming and topping are high-stress training techniques that should be done carefully and only on healthy plants. They are also not recommended for autoflowering strains that have a short vegetative phase or a fast flowering time, as they may not have enough time to recover and produce enough buds.