Salvia Nemorosa: leaves turning yellow from bottow up

pommesJune 15, 2014

Hi. I just landscaped a new property. I am a hobby gardening and new home owner so it's the first time I've had the opportunity to have my own garden.
I have a steep hillside that gets full sun. I decided to plant a lot of purple Salvia Nemorosa on this steep slope.
We had a heat streak for about 1 2/ weeks and because the plants were'nt (I thought) established yet I watered them quit a bit while it was hot....ie. almost everyday. The Silvia looked like they were melting during this time.
Now I see that some of the plant leaves are turning yellow from the the bottom. Some have yellow leaves almost to the top. BTW- I some of my Lavender (Hitcote) and Echeniecia is also turning yellow:( Hope this doesn't mean I have to destroy everything and start all over again. I read that this could be root rot and that there is no turning the plant around. Possibly that I may also have to destroy the plants. I've planted at least 15, 16 of them and at least 6-7 are showing yellow leaves. Is this that scary root rot and do I have to destroy the plants? If I do have to destroy the plants can I then transplant a new Silvia plant in the same plant hole or will it also then get the fungus? I would think so but I am new to this. I also say that because the ground is so steep that I put a coconut net to hold the ground. Then cut holes in the net where I wanted plants. If I have to put new plants in to replace destroyed ones that means cutting a lot of holes in the net.. Here's one of the plants but actually from a different location. Looks the same though:( Any suggestions? Thanks for any help.

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paparoseman(z8 WA. PO.)

They may be over watered. Cut back the watering and see how they do. The other thing it could be is spider mites although all of the watering that you have been doing tends to discourage them since they like it dryer rather than wetter.

    Bookmark   June 16, 2014 at 11:42PM
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rich_dufresne(z7 NC)

I assume that the steep soil you've planted in is virgin, not established garden soil. How big a hole did you dig? I think this is a case for digging a five dollar hole for a one dollar plant, and using soil amendments, determined by the kind of soil you are digging in. Pure clay or sand (the extremes) will require the most amendments. Also, do you know the soil pH?

A large hole with humusy soil will reduce the frequency of watering and help avoid the roller coaster ride of too much/too little water.

Humus goes a long way to removing summer heat stress with new plantings. Also, I'd consider using seaweed extract as a foliar nutrient, since it deters spider mites.

    Bookmark   June 17, 2014 at 7:57AM
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