What is killing my Petunias?

7 years ago

Last year we grew petunias with phenomenal success. Using the old adage, 'If it ain't broke, don't fix it', we are growing them this year using the same methods and materials.

We start them from seed. We get our seed from a variety of wholesalers. The die-off is occurring in all of our plants, so I doubt it is the seed.

We start in 72-cell trays using ProMix PGX. They are then transplanted into 3 1/2" pots with Kellog Patio Plus soil:

They also get a very small shot of Dr. Earth Life:

The only plants that are currently affected are those that in the 3 1/2 inch pots. We have a mixture of some old pots from last year and some brand new pots.

They are in the greenhouse with propane heat. We are not dropping dead when we walk in so I don't think there is an exhaust leak from the propane heater. We are in the Pacific Northwest and have had some fairly cold days. The effected trays were near the back of the greenhouse, furthest from the heater. Our coldest night dropped down to approx. 38F in the greenhouse.

We also have a large amount of pepper transplants that also seem to be dying in the same manner.

This is what they look like in the 72-cell trays. Everything seems to be going well:

This is one of the transplant trays with the dying plants. They seem to get a whitish tinge on the edge of the leaves before they keel over:

This tray seems to look ok. There is a bit of death on the edges of the leaves, but they don't seem to be looking sad in the same way as the other ones. I don't recall exactly where in the greenhouse this tray was so I don't know if they were touched by cold air:

Any help in this matter would be greatly appreciated. Thank you for your time.

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