PLANTS HUNGRY??? How do you tell

I've heard people talk about plants looking hungry and to look for signs of hunger..

How does one tell that or if their plants are hungry?

they will droop if they are thirsty for water, they will show deficiencies if they are lacking certain nutrients.

first sign will be yellowing of the lower leaves they will become yellow and brittle and work its way up the plant

at some point you will be able to just know when they are hungry they just ask ya