You need to stop the coffee or tea treatment immediately. That's likely the problem. Something I wrote about that:

Coffee/Tea Grounds

Forum discussions frequently center on the question of adding dilute coffee/tea or grounds to plants as a 'tonic', but Arabica (coffee) and Camellia (tea) are known for their toxic alkaloid (caffeine) content and their allelopathic affect on plants as well as autotoxic (poison to their own seedlings) effects on future generations. Caffeine interferes with root development by impairing protein metabolism. This affects activity of an important bio-compound (PPO) and lignification (the process of becoming woody), crucial steps for root formation.

We also know that the tannins in both coffee and tea are known allelopaths (growth inhibitors). There are ongoing experiments to develop herbicides using extracts from both coffee and tea that cause me to want to say they might serve better as a nonselective herbicide than as a tonic. I would not use either (stale coffee or tea) by applying directly to my plants - especially containerized plants; nor would I add tea bags/coffee grounds to my container soils.

Foliage-Pro 9-3-6 is an exceptional 'go to' fertilizer for nearly anything you might grow in a container, and it's a complete nutritional supplementation program in a single package. I use it for everything I grow in pots.

Plants need a full complement of all nutrients taken up via the root pathway in the soil at all times, even in the winter. W/o a full compliment of nutrients at adequate levels and in favorable proportions/ ratios, your plant's ability to realize as much of its genetic potential as possible, isn't possible. Nutritional supplementation is a key component to growing anything in containers well, and Foliage-Pro 9-3-6 along with appropriate watering practices takes all the guesswork out of the equation.

Al