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I have a blueberry plant that is about 4 months old and a couple of weeks ago I noticed that the tips of the two main stems (the ones that the plant came with when I bought it), and some leaves are getting dry and dark.

I live in Valencia, Spain, which is a wet and sunny city.

I moved the plant from the sun to a room with light but not direct sun, and also I'm starting to apply berries fertilizer. Also noticed that the soil I used, the acidic one, has 7 pH.

I'll attach some pictures of the plant.

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Edgar we need more information to understand the big picture for your problem. Blueberries are bog plants. Blueberries need pH of 5.5 to 6.0 max. 7.0 is too high.

I've just viewed your pictures. This blueberry is in a pot. Plants in pots have to have potting soil. Sterilized potting soil out of a bag. No water holding gimmicks no fertilizer added to that soil. Sterilized is the key. Is that pot filled with sterilized potting soil or garden soil?

From what I see, that plant needs NPK, a basic fertilizer. You said you are using fertilizer. What exactly are you using for fertilizer? I made up this little ditty; Less is best, more is death and none is dumb. Does that help? Please tell us what you are using for fertilizer, for soil. What are your plans for this shrub? Is this indoors or on a patio?

Ideally, this potted blueberry MIGHT flower and produce blueberries on a covered patio with pH adjusted soil (there are potting soils made for acid loving plants). Forget your blueberry thriving in doors. Have you guys been getting snow and freeze? Is this normal?

If you have a covered patio, take your plant out there for the day but make sure you bring it in at night. I have blueberries both in my greenhouse as well as outside the greenhouse. They are used to dormancy and cold.

Moving a plant from indoors to out of doors in the sun can kill plants. When a plant is set out of doors even on a covered patio it needs to be acclimated to temperature changes that don't happen indoors. You have to bring plants back indoors for the night. Moving plants from out of doors and direct sun to the indoors will also kill plants if not properly acclimated. More information, please. As soon as possible.

  • BTW, you should use a plastic pot (for acid plants). Your pot will be damaged by acid, and it will release bases: this is bad for plant and pot. – Giacomo Catenazzi Jun 6 '18 at 6:09
  • Thanks for your answer, I'm using hydrangeas and azaleas soil, the bag says "for acidophilic plants", exactly this: goo.gl/images/mv4zq9 . The fertilizer I'm using is fertilizer for strawberries and berries, this: goo.gl/images/j7HsmK , and I'm using it because the seller recommended it after I show him the pictures of the plant. The plant is now indoors, in my bedroom concretely, but has been on a balcony before that, I moved it because in the morning it receives a very intense sun, but at the afternoon is on shadows. – EdgarAP Jun 6 '18 at 6:13
  • Here in Valencia doesn't snow, and by the night the temperature doesn't decrease too much, is kinda warm. I don't have any specific plan for this bush, it can be at balcony or indoors, but I don't know how to acclimate it. Thanks for your answer, hope it is the info you need! – EdgarAP Jun 6 '18 at 6:20
  • P.d: I also have a room which is sorrounded by translucid windows, so it's like a greenhouse. Could it be an option? – EdgarAP Jun 6 '18 at 6:21
  • Send a picture of this room. It sounds as if you live in blueberry heaven. Why struggle to keep a plant indoors when you have no worries about freezing? Do you have a covered patio? Cut the fertilizer directions in half. If your plant doesn't have enough light to do photosynthesis, you might be adding too much. Acclimation means taking your plant out of doors in the sun for 10 minutes a day for 3 days (this is generic directions only). Then you go to 20 minutes per day for 3 days. Then you go to half an hour for 3 days. Then 45 minutes for 3 days; an hour for 3 days...etc. – stormy Jun 6 '18 at 6:32
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Actually the black tip is due to a broken branch or poor pruning. The cut should have been made just above a node to produce a side shoot. Because wood was left between the node and the cut, the plant does not see the point in feeding that area and it is dying.

You could leave it but it could get infected. Or you could prune it again, just above a lower node to stimulate a side shoot. That would be best.

The cut should be made at an angle away from the bud pointing outwards. No too close... it will kill the bud... not too far....you’ll get the same problem. The angle should be about 45 degrees ish.... use a sharpe secateurs.

Blueberries are ericaceous and you should provide that soil for them not standard compost. A top dressing every 4 weeks will give it enough nutrition. Liquid feed is only a quick fix. Growing in pots is actually fine, any pots... but terracotta is best for the roots to breathe

  • Hi and thanks! I did the cut just above the bud, leaving no wood above it. The cut was made in angle, I did it with an alcohol cleaned scissors, but the stem was very hard and the cut wasn't as clean as I wanted to. But I think the black stain is appearing again :( – EdgarAP Jun 9 '18 at 13:05

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