why do my white roses turn brown before opening?

Answer 1

Temperature. Some how, moisture is getting on the flower petals. When the temperature drops, that moisture is becoming very cold, shocking the flower. That is why you have brown spots on your roses that look like they may resemble water spots.

Answer 2

THRIPS>>>>>>>>>>> They are a tiny insect that gets into the tightly closed bud of roses and sucks the life out of the buds before they ever get a chance to open.
Thrips is always plural, there is no such thing as a thrip minus -the s
Also it is really hard to spray because the buds are closed tight and this protects the THRIPS from spray, SO...Bayer rose and shrub plant protection at your local garden center will protect the Pland for the rest of the summer. And a repeat application in the early spring next year will insure your roses are thrips free for the summer season.

Answer 3

If they are cut roses then they are old...

If they are garden roses then mositure is in between petals or you have too much fertilizer.

Cold temp will also turn roses brown or it could be bruising as if something is hitting them or banging them.

Answer 4

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Answer 5

too much fertilizer

8-8-8 once a month is enough