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I read that the best NPK ratio for indoor fiddle fig tree is 3-1-2. I have a fruit tree fertilizer with the ratio of 5-5-2. Can I use it instead? How far away from the ideal ratio is safe to go? Is there a rule of thumb?

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    The only fertilizer I have used is 9-45-15, in sparing amounts . Fig is outside 8 months and inside 4 months. I cut off about 3 ft. each fall. Apr 26, 2022 at 20:01
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    FYI, 3-1-2 is 24-8-16 divided by 8 (so 24-8-16 All-purpose Miracle Gro would be easy to repurpose there, if it's just about the NPK numbers). Apr 27, 2022 at 22:19

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The phosphorus level is too high for your fig houseplant and so is the nitrogen, so I wouldn't use it, I just use Baby Bio houseplant food for non flowering houseplants. Fruit tree fertilizer is balanced to encourage flowering and fruiting.

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I was wondering too. I added fruit tree fertilizer from dr earth 5-5-2 to my fiddle leaf fig and I'll see what happens. If it works I'll be so happy.

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