Tough, woody plants Plants likely to be over-hardened Apply plant starter solution 3 to 4 days before setting out. Decay or rotting of the stems of young plants near the soil surface. Disease organisms attack germinating seeds and young plants, especially during prolonged cloudy weather. Use of sterilized soil-mix, skill in watering and ventilating and proper regulation of temperature. Retarded root growth 1.
All factors influencing root growth are especially important.
Root growth and formation of new roots are dependent on the food supply from the plant top, good aeration, ample supply of nutrients, adequate moisture and temperature. Poor soil aeration 3. Poor drainage 4. Lack of fertility 5. Excess soluble salts 6.