If you can keep your soil pH level of the soil in the right range for the plants your growing then all you need to do is add some fertiliser every week as an extra feed,
Here's a list of all the right soil pH ranges to help you,,
I got my ruby lou and royal blue potatoes in today,, little fella gave me a hand,,
Then give the soil a good soaking and ill have some nice ruby Lou's and royal blues in about 3 months time,,,
Just keeping an eye on my garlic now, when I see some little green shoots starting then its the signal to plant,,