One possibility: That pot shows a lot of hard water scale. You might need to flush the soil periodically to keep take out excess calcium, and give it a nutrient mix.
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That sounds likely. I got some rainwater but how do I use that to flush the earth? Do I just poor it all in and wait till it seeps through in one sitting or do I switch to watering with rain water for a bit? Also if my fertiliser tells me to use a certain amount per liter per week do I mix the fertiliser with the water and then pour it in even of its way too much or do I apply it slowly over one week? I'm sorry to asking so many questions but I'm really new to plants and couldn't find answers online.
I'm not a plant expert, so I'm not an authority. I learned about flushing the soil from a roommate who'd just put the plant under the kitchen faucet for a minute or so, and let the water run through the pot and it the bottom. Since then, I've noticed that plants don't like hard water scale.
Thanks. Then I will do just that.