Nothing you can do to improve appearance at this short notice, short of snipping off every yellow & spotted leaf, but you can, in the future, stop spraying the foliage to help prevent the leaf-spot diseases they are so susceptible to. Wetting the foliage both encourages and spreads many of the most common Impatiens diseases. They're (diseases) also very difficult to eradicate once they gain a hold.

Al

Also the worst thing you can do to a stressed plant is to spray it with Miracle Grow...like feeding a steak dinner to someone with the flu.
Sorry but right now there is nothing you can do. You should have thought to cover your flowerbeds and shrubs with light weight plastic before powerwashing.
Linda C

Also the worst thing you can do to a stressed plant is to spray it with Miracle Grow.

YES, YES, YES.......thanks Linda. That sure needed to be said. It's such a common mistake.

Meant to be thought provoking and not an attack:
Hmmmm ... so are you guys saying you should refrain from fertilizing a stressed plant? What if you ran into someone who didn't subscribe to that idea? What could you offer that's convincing? - something scientific ....

I think that statement should be qualified any time you use it; that it's more nearly wrong than right; that it should never be used as a blanket statement.

I do think it's logical to not fertilize a drought stressed (dry) plant, and it's logical/elementary not to fertilize a plant that is in soil (or solution) known to have an excessively high level of total dissolved solids/electrical conductivity (fertilizer) in the soil solution. In either case, it's not the same as withholding nutrients. In the case of the plant with dry soil, it's simply a matter of allowing the plant to become well-hydrated before you fertilize. In the case of the plant that has an excessively high level of dissolved solids in the soil solution, the nutrients are already there.

For plants under stress for other reasons, it makes no sense to withhold nutrients from the plant. We cannot equate fertilizers with food, because they are not. They are building blocks the plant uses to create an energy source and keep its systems orderly and running smoothly - more like vitamins or medicine than food. Who would withhold vitamins & medicine from your kids/pets because they are not feeling well or are malnourished?

I find no harm in continually maintaining an appropriate level of nutrients in the soil. Any time nutrient levels drop below adequacy ranges, they should be supplemented, even if the plant is under stress or strain (except for drought stress or stress/strain attributable to causes other than drought or over-fertilization, as noted above, but this is still too elementary to beg the blanket statement). After all, in MANY cases it's a nutritional deficiency that caused the stress/strain in the first place. Are we to sentence these plants to death by withholding the nutrition they are in need of so we can be true to the mantra of never fertilizing stressed plants? Using that philosophy, you could NEVER correct a nutritional deficiency because the plant is stressed - therefore it should never be fertilized.

I could provide more information that links the byproducts of a robust metabolism to increased resistance to insects and pathogens, which would show that withholding nutrients actually induces stress, but that wasn't the purpose of my post. I simply wanted to point out that unless you should not ignore the obvious and fertilize a dry plant or an already over-fertilized plant; and that you should continue to provide nutrients in the adequacy range, regardless of whether the plant is experiencing stress.

While not an inherent stress, we can stress plants through ammonium toxicity when we apply fertilizers that get their N from urea when we apply it when actual soil temperatures are above 85-90* or below 50-55*. Again, this is very specific and can't be included under a blanket statement.

Al

Plants cannot grow w/o a full compliment of nutrients, and "Plants that are not growing are dying." Dr. Alex Shigosize>

The point we are trying to make Al is simply that the word MIRACLE might be on the label, but salts and micronutrients won't do diddly to 'save' a plant subjected to insults and return it to it's former glory in the short term.

Neither will withholding same from them for a few days until you can assess what you are working with. This is a reaction to so many posts where somebody got a plant accidentally sprayed with roundup, or the dog wee'd it halfway to death, or it got pruned severely and then they add that they watered it and put on 'plant food' as a remedy or medicine. It's not. If a plant is reasonably healthy and has had sufficient nutrients all along, adding more to 'help' it just is redundant, and could in some circumstances cloud the issue of damage or even cause damage.

But see - now you are adding lots of qualifiers by saying 'if' and 'and' that were not there in the previous. There are many, many cases in which a nutritional deficiency has led to stress and general weakening, insect infestations, pathogen invasion - both biotic and abiotic, and other issues that can never be reversed unless the deficiency is corrected. Your choices are to allow the plant to slip from stress to strain to death unless the deficiency is corrected, or to fertilize a stressed plant - and this is not an isolated case/condition. It happens very frequently. From this alone, without considering any of the other reasoning set forth, we should be able to see that you cannot use that statement as a blanket and be accurate. I realize it's repeated over and over again, but you will probably find a great deal of difficulty supporting it with anything scientific.

I know you said that "... salts and micronutrients won't do diddly to 'save' a plant subjected to insults and return it to it's former glory in the short term.", but all the macro and micro nutrients plants need are salts, and they are absolutely required for either maintenance or restoration.

I feel like I'm probably belaboring the point now, and I know we're a little off topic, so I'll leave the last word to you if you have something to add.

Al

A plant planted in decent soil with organic matter present needs no power boost.
Often, for one reason or another, root damage,sun damage, drought, disease a plant that "looks sick" has had it's ability to transport water to the leaves impaired. Givine it a shot of nitrogen, phosphorus and potash won't help the problem and may acturally destroy more root hairs.
And Al...you will be surprised at how well plants grow on nothing but compost, alfalfa, and blood meal....much better than when I was spraying everything every month with Mirical grow or digging rose food around the plants.
Linda C

What makes you think I'd be surprised? I'm a firm believer in 'feed the soil' when it comes to gardening in the earth .... and practice it. ;o)

Anyway - the rest I'll just let be. We both presented our case & the readers can sort it all out if they have interest.

Take good care. ;o)

Al

Impatiens...not impatients (no "t")....