It highly unlikely that a hummingbird would have a liver failure due to feeding too much on the flowers in the garden. However this is a known risk on the home-made of store bought nectar if used in higher concentration. So is it safe to use it in the recommended concentration? Is an organic or homemade nectar without artificial additives better? Again, there may not be enough science to be certain about the concentration of sugar solution that may be safe for them whether it is store bought or home made. Nutrition recommendations keep changing even for humans. So can we be certain about what is recommended for birds?
Therefore it is safest to grow flowers for hummingbirds whether it is in a large garden or a small space balcony. All the plants listed above are natives of El Paso region and grow here quite easily. Hummingbirds are found all over the United States, even in Alaska. There are several native and well adapted hummingbird friendly plants for each climate region of the United States. Local libraries, nurseries and regional websites may provide more information on these plants.
Attract hummingbirds in small spaces
Even if one does not have a front or backyard space to grow flowers and there is only a small balcony or patio, hummingbirds can still be attracted without the feeders.
Grow Salvia or Penstemons in hanging basket or containers. These plants can do well even in small 1-2 gallon containers. Hummingbirds will come quite close to the ground surface as well to feed on the small height plants. During winter these plants in the balcony could be covered by a fabric sheet or frost protection fleece and watered only once in 7-10 days.
Bright red garden art could also be displayed in the balcony or patio which will attract the hummingbird from a distance and once there it will find the flowers in the containers.