If there is a serious risk of night frosts, spray the crops, eg flowering soft fruit plants, or sensitive species such as beans, tomatoes, early potatoes and also basil in the evening with a valerian solution... If plants are covered with hoarfrost in the morning, a second application of valerain will often save the situation. (34)
The morphological distortions and dystrophic results of excess ehtylene exposure were alleviated by 507. The light exposure of plants to ethylene stimulates growth and this is enhanced by 507. (29)
Cereal crops which show signs of frost damage should be sprayed with 500 plus 507 early in Spring. (57)
To lift nitrogen-502, 503, 504, 505 evening; 505, 506, 507, 508 morning. (7)
In 1993 ... we were not set up to irrigate. On July 30th the scarcity of rain finally led us to do some watering-in of the tomato plants ... at 12 gallons of water into which we put 4 units each of Barrel Compost (Thun recipe), #500 and #507. After stirring for 20 minutes each plant was watered with half a gallon more or less.. since this was not enough for all our plants a second batch was stirred with the 4 units of #507... Prior to treatment, all the plants has been experiencing a severe infestation of flea beetles. On the morning after treatment the first group of plants which had received the #507 had nothing but dead flea beetle carcasses on them whereas the second group of plants, the flea beetles, although moving sluggishly, were alive. A few days later the flea beetles had essentially disappeared from both groups of plants... we had possibly the best tomato crop we have ever experienced. (262)
We have used valerian spray in August and saved a half acre of basil, tomatoes, peppers, melons and squash from a killing frost that repeated a second night. We sprayed the first evening only and saved all but three basil plants.
We have also sprayed in September. Dewane sprayed his name on the pumpkin - squash patch - just for fun. the first frost would just kill the upper leaves and not harm the fruits underneath. It worked! You could read his name in the still-green leaves.
We stirred a capful per gallon of water in 5 gallon buckets for 30 minutes, and then sprayed with backpack sprayers. Interestingly, by midway through, I felt the "insulating blanket" form on my face and shoulders from walking through the spray drift. I've not tried valerian on young spring transplants. (Reported 24-3-2015) (58)