What is the best fertilizer for house plants, suitable for both indoor plants and outdoor ones?

I am interested in ordering through the internet so, guys, please include a reliable site through which i can make my purchase. (I live in Greece - so one that delivers to Greece would be handy and most appreciated)

What is the best fertilizer for house plants, suitable for both indoor plants and outdoor ones?
I like Miracle Grow. I have no idea if you can get

it in Greece. Sorry. I use it half strength every time I water my plants from February to October, then I just use it once a month.
Reply:1.vermicompost 2. grow wheat grass to a height of 5" , turn it upside down, crumble it and use it as a manure. The roots of wheat grass are very rich in nitrogen and all elements necessary for plant growth., This is the best organic manure for indoor or outdoor plants
Reply:not sure if miraclegro is there but i use it for in n outside plants for the best growth gl
Reply:Worm castings, or vermicast, is so heavily loaded with nutrients, it's gotta be the way to go. You can use it indoors or outdoors. I wouldn't use it outdoors if the thing being planted is vegetables. It attracts worms which is great for the soil but they could eat the veggies. You can get the stuff at www.1800TOPSOIL.com. There are links to large and reputable landscape supply companies throughout the USA and many of them deliver to just about anywhere. Good luck my Greek friend!
Reply:try Osmocote. it's pricey, but use it only twice a year.