This is something I am facing right now, as some plants are showing signs of fatigue and need some strong food to continue their mission.. I have been giving them organic nutrients by sticks / pellets (around the container along the rim), and also via watering ... (seaweed & chicken manure fert)
Some containers no longer allow for side dressing (I can't dig any 'holes' any more), but I think it's OK just to sprinkle the granules lightly around the roots and water: tha plant can absorb nutrients with every watering as the fert slowly melts into the soil.
I've noticed that local effect... The answer is, I guess, to spread the fert evenly around the plant in different locations. It's a challenge to remember where I stuck that spike, but perhaps the leaf color gives a clue?
(Currently using Neudorff Tomato & Berry feed and some Finnish organic brands, both sugar beet and chicken based)
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