A friend confessed to me via text that she has killed her last five fiddle leaf fig trees and said that she is ready to give up. DON'T, LADY. You go get yourself a new figgy baby and read this:
Plenty of light is key for the healthy growth of a Ficus lyrata 'Fiddle leaf fig' but specifically bright, indirect light and a ton of it. But you already know this, right?
What most may overlook when it comes to houseplants is the need for nutrients. Since indoor plants are contained, they depend on their people to deliver the necessary nutrients to ensure healthy, successful growth. I use a concentrated organic liquid fertilizer called Grow More Seaweed Extract that contains naturally occurring cytokinins, gibberellins, and auxins. Only 1 oz of the liquid fertilizer is needed per gallon of water so a bottle will last you quite a while. Apply fertilizer once a month.
In the hotter months you should water your fiddle leaf fig tree no less than once a week. When you water, do it evenly around the container. The media should never feel bone dry to the touch.
I keep saying "media" because I'm borderline anti-soil indoors. Well-draining container media is crucial and I've had such great success growing indoors with coco. I use an OMRI listed coconut coir/perlite blend made by a local, sustainably-focused manufacturer, The Coco Depot. The media is 70% coco and 30% perlite and is perfect for containers, large or small. I prefer this over potting soil because I never have to worry about my plants' roots rotting.
The fiddle leaf fig tree's large leaves accumulate a lot of dust. Keep the leaves clean by wiping them with a slightly damp rag once every couple months.
I hope this was helpful. I've had my fiddle leaf fig tree for almost three years and I plan on keeping her around a lot longer!