If you plant nether wart, it will seem to never grow. Actually it grows, but the texture never changes.
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Even then some still won't change texture. Bizarre.

Should be in order from top to bottom. Notice the small patch my crosshair is over does not appear fully grown. But, when I break it, three nether wart come out. Now.. the to right there is a fully grown patch of nether wart. When I broke that, only one nether wart came out (none fell in the water). It looks like the textures are reversed. This could easily be because I grew my nether wart in a lit area, but even without light, the nether wart does not show the proper graphics. When grown in the dark, all the nether wart look ungrown despite the likelihood all of them actually are.

(Ordered bottom to top >_> Again. I can't figure out how to send those pics in a controlled order.)

To add, I used torches in my farm for this bit of nether wart. I use iOS however, so that my be the reason torches work instead of just sunlight.

OK so basically I have my nether wart farm in broad daylight stage one looks like stage 1 and then it grows to stage 2 stage 3 looks like stage 4 and stage 4 looks like stage 1

I would like to add that the nether wart appears to show stage 4 texture at stage 3, rather than keeping the same texture as stage 2, then loops around.

So I guess you're saying the texture is too red when it grows?

no, it appears to be fully grown at stage 3 (second to last stage), and mature crops have the same texture as freshly planted n-wart. basically, freshly planted wart is indecipherable from fully grown.

I've gotten varying results, but something is definitely not behaving right. You can see one possible anomaly in my screenshot. When you break the nether wart (break the soul sand or switch to survival mode), you find it is premature only in texture, not growth itself.

that was what i have been saying, but i dont think it's something a resource pack can fix.

In 0.15.4 on iPad, it still behaves as Nathan Lang describes. That is, when the Nether Wart is fully grown, the texture changes back to the initial picture. This makes it seem like it never grows at all, but when harvesting it it does produce the multiple items as expected.
In other words, there seems to be a texture error with the fully grown texture begin shown at stage 3, and the initial texture (of stage 1) being used at Stage 4. It doesn't seem like Stage 2 and 3 share the texture image, as various documentation indicate.

Confirmed in PC windows 10, 0.15.8, survival.
According to wiki, there are 4 stages of growth for nether wart, stage 2 and 3 are supposed to share half-grown image, and stage 1 (just planted) and stage 4 (fully grown) has their own unique image.
However in PE, instead of stages 2 and 3 sharing an image, stage 1 and 4 do, in other words a fully grown nether wart looks identical to one that has been just planted, and stage 3, which isn't fully grown yet, looks largest (as if it was fully grown).

Please reply if you're still able to reproduce this issue in the latest beta build (0.15.90.8)

This is happening in 15.10. Yesterday, I planted a small netherwart garden in overworld in a cellar type environment - low roof a few torches. I planted them using Windows 10 edition. Today I checked it using Android MCPE, and found all the netherwart appeared to be at stage 1 so I wasn't going to harvest it, however, upon harvesting 4 netherwart plants I collected 8 netherwarts, so at least 2 of the 4 had to be at stage 4, based on the minecraft wiki info. Note - this is in my Realm.
Fixed in 0.15.90.8

Sorry. I read it as 15.9.xxx and figured i was running the latest version.
I've noticed the texture does change when exposed to ample sky light (9 to be exact), and sky light only (Sky light is sunlight during day, which is used to calculate sunlight depending on the time). Block light doesn't cut it.