It is difficult to say precisely how much your yield will be, because there are many factors that influence the size of your crop. One of these factors includes what medium you used to grow your plants in. Soil, perlite, and coco coir have unique characteristics conducive to growing different plants. Guava Gelly has produced better yields when grown in soil. The temperature of the room you grow your Guava Gelly plants in can also affect their yield. 65-75 degrees Fahrenheit is recommended for maximum production. The environment you choose for growing can also affect how much yield you get from each plant. Make sure you keep a close eye on the humidity levels in your growing space, as well as monitoring the PH levels of your water and nutrients--as this can make an enormous difference in how well your plants respond to their environment. Finally, some growers prefer pruning their plants so that they develop more side branches rather than one large main cola (the central bud on each plant). Guava Gelly grows very tall and has a tendency to produce more buds on its lower branches than at its top—so if you are looking for higher yields per square foot or meter, then pruning might be worth.