Reason #1:

   WATER

We know when impatiens will be less than great when we hear "oh yes, the sprinkler systems takes care of the watering."

1. Flowers in the sun almost always need more water. Because auto sprinklers water everything uniformly, flowers in the sun will mostly likely not receive enough water to become robust specimens
   
2. Impatiens in shade or partial shade need less water. These flowers may thus become over watered by relying only upon your automatic sprinklers
   
3. Sprinklers may reach and water all your (young low to the ground) impatiens. However, as your flowers grow, the stems may block the spray of sprinkler water causing some to flounder from lack of water
   
4. Flowers planted under the roof line almost never receive rain water. These "captive" flowers need hand watering to survive and thrive

Reason #2:

   FUNGUS

Impatiens are virtually trouble free but can contract fungus

Fungus kills impatiens in one to three days. The appearance is as if they needed watering.  If your impatiens catch the fungus, they look melted

Too much water and too little water look exactly alike...limp and weak. Test for too much or too little water by poking your finger into the soil about one inch. Wet? Then your limp impatiens are about to get fungus and die. Stop watering immediately. Test daily with your finger and you may save your flowers by backing off the water.

Fungus appears often with impatiens in pots and impatiens with mulch. Pots can easily be over watered. Add some rainy days and all can die. Mulch holds water. With over watering or a period of ongoing rains, mulch can kill impatiens by providing an environment for fungus. Never mulch impatiens (except in full sun conditions).


Reason #3:

FOOD

It is common sense to know plants need food and water

Professional flower growers (nurseries) always use quality fertilizers. You should too, but be careful to not over feed with strong liquid fertilizers. You can easily "burn" your flowers. Master Gardener prefers NUTRICOTE for time released 90-day feeding with all essential minor elements included

If you don't provide fertilizer, you can't expect robust impatiens, period

Impatien color combinations, photos