5 of my 10 euonymous patens seiboldina shrubs are becoming pale to yellow in approximately 50% of the leaves. they are 3 years old 3-5 ft tall and wide, and I transplanted them in the beginning of the summer from my old house.

I don't know why this is only happening to some. I supplemented the clay like soil with a variety of additives - peat, humus, etc, and watered with root starter solution for a while, and they did great for the first 3-4 months, but over the past few weeks have begun a color change, which I think is abnormal because not all of them have this happening.

Any tips?

I live near philly, and don't know anything about my soil ph, etc.

Doggdoc, you may want to try giving your eus some fish fertilizer , seaweed and bonemeal. The seaweed will provide the micronutrients that all plants require and by the sounds of it your shrubs could be suffering from transplant shock although I am no expert. The reason I am suggesting the above fertilizers is that two years ago we started having problems with burnt tips on new growth on our variegated euonymous ( although it's not the same problem) . We went to a local nursery who suggested some awful chemical spray or pull the shrubs out - but our shrubs were about 6yrs old. So we came home and decided to give the above fertilizers a try,within 2 weeks they looked better than ever and have been giving them a regular feeding about every 3 weeks spring through till fall ever since. Hope this helps you out. I live in Southern Ontario Zone 5 approx.

I would agree with Mr. Bean. I live in Philly and have a euonymous...although not the same as yours and mine is only 2 years old. Since my research indicated that it was very hardy, I planted it in an area where the neighborhood pups could "water" it to their hearts content and leave my mediterranean heathers and yarrows alone! But I use sea kelp and/or fish emulsion for intermittent feedings...and about an inch of compost every spring and August. So far, it hasn't looked stressed...good luck with your baby.