Hi Phil, I use Miracle Gro all the time, actually every other week and with great success. It has always improved my plants performance including my begonias. Did you use the miracle gro aplicator? It dilutes the formula when attached to a hose. Other forms of application are the feed and gro type. Wayne

I did use the applicator attached to a hose. I am just puzzled.

Maybe the applicator mis-functioned? Too-strong fertilizer could certainly damage plants, but unless there was a major break-down I wouldn't think that would do it. But I tend to under-fertilize, partly to avoid that very problem-- (Actually, I under- most everything. Under water, under pot--except when I want a begonia I know will grow big quickly, when I over-pot--!) They take a lot of abuse. 'My name is Nancy, and I'm a plant-abuser.' Oh dear.

Hi, i just did the same exact thing. I fed all my plants and only the waxies withered up. Not certain they are dead, but sure are unhappy. I tend to over-feed, and i did add epsom salt. Every other plant or flower loves it. This happened a few months ago, but i didn't relate it then. The tomatos love it. However, they did come back. Hope that helps. My name is John and I'm a plant killer.

I always cut the recommended measure of fertilizer, any fertilizer, in half. If it says use a full scoop to one gallon of water, I only use 1/2 scoop. Someone told me to do that years ago and I think she worked at a greenhouse. Hope this helps.