There is a dandelion in the upper left corner of this barrel of plants (Fig. 16) and next to the railroad tie in the elevated container of juniper (Fig. 17). The wind dispersal mechanism of dandelion facilitated the seeds getting into these containers, but how did the catnip plant get into the large cement pot in Fig. 18? Catnip doesn't disperse by wind. Maybe a bird ate the seed then deposited it while sitting in the tree, or perhaps the tree was transplanted here and the seed was brought along in the soil.

Some grass in Fig. 19 has found a small patch of soil between the cement blocks in this window well. This may not be much, but it is all the grass needs to grow.

Figure 20 is a picture of some over-wintering purple loose-strife in a graduate student's experiment. It looks like some grass has invaded the experiment.

The thistle in Fig. 21 has commandeered the tub from a terminated experiment. Perhaps its plumose seed was blown in through the vents or was caught on someone's clothing when they were outside.

Select Next Page: 1 2 3 4 5