Positive change
The petals grow upside down and turn when they reach maturity. This also represents an important gift in the context of friendship: growth and change over time ensures that the friendship becomes even more beautiful. As the icing on the cake this friendship flower also represents wealth, prosperity and happiness.
Nice and colourful
You can also add further meaning with colour. There's plenty of choice, since the alstroemeria comes in pink, white, yellow, orange, red, purple and salmon. Time to give them away!