Maybe this will help some. Be sure to look at Lady in Red salvia...

Here's some data from the Lousiana Ornithological Society Newsletter, March 2003, written by Dennis Demcheck. The 3rd number is the average percentage. The higher percentage may be preferred by birds but the number of total visits to a feeder may be higher with the lower percentage.
Sugar concentrations for selected plants, May 2001-November 2002
Plant Minimum % sugar Maximum. % sugar Average % sugar Number of Samples
Forsythia Sage: Salvia madrensis 28.2 33.6 *31.4 16
Anise Salvia: Salvia guaranitica 20.0 33.5 29.0 23
Remsens Sage: Salvia guaranitica hybrid 22.8 35.8 *29.1 24
Orange Mountain Sage: Salvia regla 26.6 >35 *32.0 11
Mexican Bush Sage: Salvia leucantha 27.2 >32 *31.2 10
Mexican Bush Sage, "Waverly" Salvia leucantha 26.6 29.0 27.7 4
Belize Sage: Salvia miniata 21.8 >32 *27.1 7
Lady in Red Salvia: Salvia coccinea 30.4 38.7 33.2 3
Red Hot Sally Salvia: Salvia splendens 16.5 18.9 17.6 4
Van Houttii Salvia: Salvia splendens 18.6 28.6 22.3 16
Winter-blooming Shrimp plant: Justicia sp. 23.0 >32 *27.3 9
Summer-blooming Shrimp plant: Justicia brandegeana 23.5 >35 *29.7 11
Trumpet vine: Campsis radicans 27.8 34.3 *31.2 10
Giant Turks Cap: Malvaviscus pendulaflora 17.0 24.6 20.5 14
SultanÂs Turban: Malvaviscus drummondii 16.0 >32 *22.2 7
Chinese Lantern, Orange variety: Abutilon pictum 14.9 26.0 21.7 23
Chinese Lantern, Pink variety: Abutilon pictum 19.5 40.1 *29.4 6
Cigar Plant: Cuphea ignea "David Verity" 24.6 28.0 26.8 6
Mexican Cigar: Cuphea micropetala 27.1 29.6 28.1 6
Yellow Justicia: Justicia aurea 22.3 25.8 24.5 3
Firespike: Odontonema stricta 15.6 21.0 19.2 10
Coral honeysuckle: Lonicera sempervirens 18.5 24.0 20.6 13
Firecracker vine: Manettia cordifolia 13.1 29.4 21.7 8
Firebush: Hamelia patens 20.2 22.4 21.3 4
LionÂs ear: Leonotus leonurus 15.3 19.2 16.9 3
Crybaby tree: Erythrina bidwillii 18.2 22.5 20.2 3

Note: * indicates that Greater Than (>) values were used in computing the average.
> 32% was averaged as 32%; >35% was averaged as 35%

Interesting!

I wonder what the percentage is for the sugar water that we all make.

One would think that if we are mixing 4 parts water to one part sugar that it would between 20% and 25%, but as we all know, if you add 1 cup of sugar to 4 cups of water you do not get 5 cups of solution, it is more like 4 1/8. To make is simpler... would mixing 1 cup of dry sugar to 1 cup or water(liquid) give a 50% solution? Just what are we giving our hummers with the 1 to 4 and the 1 to 3 mixes?

Ken

The 1/4 ratio we use for nectar comes out as a little under 25% about 22 or so, then the 1/3 comes closer to 25%, but not really sure about that. If anyone can pin point it for us that'd be great. I was wondering though, are these all the plants he has? Does he have more plants on a website or something? For instance would like to know concentration of foxgloves, cuphea bat face, and pentas, also don't have this plant but wondering what the concentration of Bee Palm is, heard it was 50 percent concentration.

Those percentages don't really make sense. When you go to 1 to 3 you are using 25% less water than 1 to 4, so I don't see how the concentration would only go up 3%, especially if we are treating the dry and wet uints as equal for the 1 to 4. Of course I could be wrong as I am just going by common sense rather than numbers of actual sugar water.

For your Sunday afternoon reading pleasure...

Here is a link that might be useful: Info

Oh my... now I have a headache. :c)

Thanks for the link ctnchpr! What ratio do you use in your feeders by the way?

Ken

Ken, I'm not very precise with the measurements - somewhere between 1:3 and 1:4.