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Indiana (Zone 5a)
Aug 10, 2017 3:49 PM CST
I just joined this forum today.
I am very new to roses.
All of my roses are newly planted this spring.
I have no idea what the names of my roses are or what type.
I just buy them and plant them because I like the color.
It is August here in Indiana and it has rained a little this month so far.
Possibly an inch over all.
I have a question about my roses.
1) I have a blue/lavender colored rose that has been planted about 4 months.
The rose has done well since planting.
Last week I noticed that leaves on this rose was turning yellow/green on the older leaves.
The new growth will start out red then will quickly turn yellow with the edges the red color.
I have looked up the problem on the internet and got several possibility's as to what the problem my be.
Calcium deficiency, potassium deficiency or possibly nitrogen deficiency.
It was suggested to add Boric acid, bone meal or nitrogen.
I have added a picture of this rose.
It produced buds and bloomed OK for a new plant.
All of the other roses in this garden are looking good.
Any help with this problem would be greatly appreciated.
Aug 10, 2017 5:02 PM CST
The red on the new growth is probably normal. If the oldest leaves are turning yellow and the veins are not obviously more green, then it's more likely to be nitrogen deficiency. If the oldest leaves are turning yellow but the veins are still green then it's more likely magnesium deficiency. It actually doesn't look bad in the picture although it looks like you may have a little black spot disease starting in the lower middle leaf.
Have you fertilized them with anything? My suggestion would be to get a soil test rather than trying to guess. The nutrients that you're thinking may be deficient would all be supplied by a general garden fertilizer that has micronutrients, but the soil test will give you a clearer picture of what is needed. It's equally important to avoid applying too much of any nutrient because it can cause a deficiency of other nutrients.
Indiana (Zone 5a)
Aug 11, 2017 9:21 AM CST
Thank you for the reply.
I do have a problem with black spot on some of my roses.
I am working on that.
I do fertilize my roses on a regular basis.
A little Miracle-Gro , Rose Tome and some Sea Magic.
I have tried some nitrogen around the rose and does not appear to help.
The other roses in the same area are doing great.
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