Can you use aquarium fertilizers on normal plants?

[EntirelyEm]

I have been hit with the urge to attempt to grow a lemon tree from seeds. However, I have never been able to keep a plant alive... i even managed to kill a cactus
(・−・;）Anyways i got like 3 boxes of aquarium supplies for free a while ago and when looking through the stuff i found a bunch of aquarium fertilizers. I don't have live plants in my aquarium so i never had a use for them. Would i be able to use them for a lemon tree?? Or would i have to go out of my way to buy proper plant fertilizer at some gardening store?

 

[SouthAmericanCichlids]

Kribensis27

 

[EntirelyEm]

Okay so I've decided to do a little experiment!
Im going to plant some seeds in different little pots. One with soil from my backyard mixed with fertilizer, one with dirt from my backyard on its own, because i do not have proper seedling soil and don't feel like going out to buy some.
Worst case scenario: neither one of them sprouts, but its not the end of the world.
I'm gonna water them with left over aquarium water from water changes, and I'll keep this thread updated i guess.

 

[WagglePets]

Okay so I've decided to do a little experiment!
Im going to plant some seeds in different little pots. One with soil from my backyard mixed with fertilizer, one with dirt from my backyard on its own, because i do not have proper seedling soil and don't feel like going out to buy some.
Worst case scenario: neither one of them sprouts, but its not the end of the world.
I'm gonna water them with left over aquarium water from water changes, and I'll keep this thread updated i guess.

goodluck! I’m curious to see the results

 

[Broggy]

ive always wanted to grow a tree in my aquarium water. ive killed cactus as well, I watered it a couple times a month and put it in the sun and it got mushy on me

 

[Cherryshrimp420]

Aquarium ferts are gonna be really weak compared to land ferts because land ferts can be a lot more generous with ammonia since no fish to worry about.

 

[GlennO]

Are they dry or liquid fertilisers? I'd probably wait until the seedlings have germinated and grown a bit before applying any. Also backyard dirt is not ideal for seedlings. It's often too heavy and doesn't drain well enough which results in fungus issues. If you have sandy soil you might have more luck.