FOCUS: Odd bumps and lumps on twigs, buds, and weed stalks might be galls, swellings on plants that are homes for an insect, mite, or other organism. A gall-maker causes its particular host plant to form a bulge in which it will live and feed for a time. Galls on buds, twigs, roots, or leaves of plants provide a safe home for the gall-makers and are an essential part of their life cycles.
INTRODUCTION
Objective: To begin to explore and ask questions about galls.
Ahead of time, collect a selection of goldenrod stems with goldenrod ball galls on them. Make sure to cut the stems so they are long enough to show the gall(s) and the seed head at the top of the stalk. Pass out a goldenrod ball gall and magnifying lens to each child, and ask children to observe and describe their gall.
Materials: ball gall on a goldenrod stem of either tall goldenrod (Solidago altissima) or late goldenrod (Solidago gigantea), one for each child; magnifying lenses.
THAT’S MY GALL
Objective: To make observations and ask questions about goldenrod ball galls.
Using the goldenrod stalks from the Introduction, encourage children to look closely at their galls. You may wish to prompt their investigation with these questions: Continue reading Galls Galore – Activities