They look a lot like Euonymus fortunei.

Yeah those look like my BB's new growth too.

These two overwinter in the basement because I accidentally bought a pair of southern highbush ... They come out of dormancy too early outside. The five northern highbush live in the ground. These require too few chill hours before being willing to declare winter over.

Okay, I guess I've never noticed tiny serrations in my blueberries' leaves, but then I use Jersey as my paradigm of what a blueberry bush should look like. After heavy analysis, I was able to discern some microserration on some of the leaves of my Bluegold. I can't find any other leaves on any of the bushes with trichomes on the surface, though, is that unique to young Sunshine Blue?

Never seen Euonymus fortunei ... there's a golden eupnymus a few feet away, but it's quite prostrate and also has smoother leaves with different style of serration.

Euonymus has opposite leaf arrangement. I don't see that here.

Too few chill hours won't hurt anything! When a plant needs chill hours, it needs a minimum to set fruit...so fewer is better! They really don't look so good being indoor plants..I'd put them in the ground asap.

The problem with too few chill hours being declared the end of winter is the plant coming out of dormancy in like January ... so no fruit because the flowers freeze in the still winter of February, March, April ... some years I'm concerned still about flowers being frozen in May. Stupid bushes still barely stay in dormancy long enough in the basement.

Jersey takes 800-1000 chill hours and does great here; Sunshine Blue needs 150 ... a month of 40°F nights? That could be October, it probably got a few chill hours already last night. We'll probably have a nice warm 60°F streak in December, which they'd think is spring and break dormancy since they'd already exceeded chill hours and only need a warm up to break dormancy ... Jersey needs 5-10 times as much chill time, so like 300 hours in October-November isn't enough if there's a random warm up in December or January ... there is absolutely such thing as too few chill hours.

No...you won't get that! Plants come out of dormancy when the weather warms consistently...they know what to do...they may blossom and an early frost will nab them..that's a whole different thing that happens to many fruit growers every once in a while...but a warm spell in january will not warm the soil enough to break dormancy...

I'll be sure to inform the forsythias about how they're supposed to know better next time they're blooming in February.

I dug up the data I was looking for ... well, kind-of ... it's from VT because I couldn't find the desired dataset for MA, but it'll do for example.

Note how the ground temp goes up in mid-December after a fair bit of cool weather (a.k.a. chill hours) and then the temperatures fall off a cliff for early January and mid-February. Probably only up to about 45°F, but of course that's only one site, surrounding areas could be either colder or warmer.

Fall 2020 showing some lovely variation ... checking local temps, 150 chill hours would have been achieved by the first few days of November, just before the last 60°F average temp peak with 50°F ground temp ...

I'm not convinced Sunshine Blues would stay in dormancy ... They'd have completed endodormancy and entered ecodormancy, which only takes some unseasonably warm weather. Jersey and my other northern highbushes, no problem, still in endodormancy waiting for the other 600-800 chill hours they need. Southern highbush ... foolish error, and I suppose zone hardy, but not really appropriate.

Good grief, I missed the screamingly obvious. Sorry.