This is the warm tray with the cucumbers and okra already moved into larger pots. The closest peat pods have peppers, which are just now germinating. The rest is tomatoes which for the most part germinated within a few days of being planted. The caro rich and marmande super were slower to germinate than the rest but are finally coming up now. The weather has been quite cool for the last week or so and my tomatoes have been stuck indoors. Even next to a window there is just not enough light for these full sun summer veggies so my little tomato stems were all turning purple. On older plants this could be a sign of lacking nutrients but since these do not have any true leafs yet I knew something else had to be stressing them out. After a little research I learned that lack of light or lack of warmth can cause the stems to turn purple. I decided to go back to using a heat mat and also to go buy a grow light.
I have had it for several days now and most of the purple has gone away. The new growth on the stems is green like it should be. I gave them some very diluted fish fertilizer as well, just to be sure. In addition to turning purple a lack of light can cause spindly plants with weak stems. For about the price of a few tomato plants at a nursery (about $12) I have helped all of these little tomatoes to thrive one more. It needs to be quite close to the plants so for now I am just setting the ends of the light on the edge of a taller tray and a tub of oxyclean. Nothing fancy here but it works and that is all I care about.