Expert: Mike Mascio - 5/5/2008

Question
I have a pot filled with impatiens from last summer.  They are green and
healthy but not a bud to be seen.  How do I get them to flower?

Thank you for your time and advise.

Peggy

Answer
Peggy, when flowering plants fail to bud, it is usually an indication of too much water or insufficient nutrients in the soil.

Potted plants should be watered only when needed. This is usually when the soil dries 2" below the top. When watering is required, be sure to water deeply to the point the water runs out the bottom drain hole. Then do not water again until needed. An even better method is to purchase a water meter. Simply stick the rod all the way into the soil. The meter will measure the moisture level and indicate it is time to water.

In regard to soil, flowering plants need a soil high in phosphorus. This is the second nutrient listed in the three number ratio on the front of the fertilizer package. Avoid fertilizers high in nitrogen (the first number listed) as these tend to promote lush foliage at the expense of flowering. A good ratio for flowering plants is 10-20-20, with the third number representing potassium, the nutrient needed for strong root development.

If you follow these procedures, the plants should bloom abundantly throughout the growing season.

Good luck, and please write again if I can ever be of assistance.

Regards,

Mike