I have a feeling you are asking about a specific type of plant This is a common issue when growing cannabis indoors and the general solution is to have oscillating fans blowing gently on the plants. Give the plant optimal growing conditions as described and the dieffenbachia will put out new growth from. Free Plant Identification Plants Garden Zz Plant Repeat the pinching at. How to make plants grow thicker stems . Potassium Silicate One of the most effective hydroponics supplements for getting thicker stems is potassium silicate. View Of All The Plants. TheDifferenceX Lucky Luke GroErr and 1 other person. The best way is to add nitrogen f ertilizers to the ground for tomatoes. The roots of the tomatoes will extract nitrogen from the soil. Cool daytime temperatures 60 to 62 deg F should be maintained in cloudy dull weather. Growing the plants tight in the pot also reduces leaf size and shortens internodes. If you train it from seed and the plant doesnt have to str...