I have been using these tomato fertilizer spikes for many years. I grow tomatoes in pots on my deck. I give each pot 2 sticks at planting and then again when the flowers are blooming. I can attest to the ease of use and the abundance of fruit that I get each year. I also use the houseplant fertilizer sticks and flowering houseplant fertilizer sticks. I really rely on Jobes' fertilizer! Anyone would be love to use them and will be pleased with the results!