Question
We live in northern ocean county,New Jersey.I planted two anomala petiolaris about five years ago against a chain link fence at the back property line that borders woods. They are facing east so they get morning sun (about 4-5 hours).The soil is a sandy loam. They are growing very slowly and have not flowered at all.Should I transplant to full sun location or keep waiting.

Answer
Hello Bob

After 5 years you should be able to expect flowers on your plants!  The position of your Hydrangea petiolaris is fine - this variety isn't really fussy about position and should do well in sun or partial shade and as it prefers a well drained, rich soil, your sandy loam should also suit it very well.

The only reason I can think of for your plants not flowering is that the soil may need to be enriched - if the woods are close to your boundary the plants will have to compete with the trees for water and nutrients .  

Try mulching the Hydrangeas with some well rotted garden compost or leaf mold to a depth of about 3", but don't pile the mulch up against the stems, as that could cause them to rot off.

Next spring, just as new leafs are showing give the plants a good dousing with a liquid general fertilizer, and spread more mulch.

You can repeat this during the growing season at monthly intervals and if the weather becomes very dry, water the plants really well.

Hopefully, next year you will get a good show of white lacecap type flowers.