Summertime is here, so I've taken up gardening. Old hat to many of you, but it's new to me. So a few weeks ago, when a friend told me nasturtium seeds would be easy – a gardener's instant gratification she promised – I decided to start there. I bought nasturtium seeds and potting soil and planted some in a peat pot the size of a small votive candle. I checked a reference book I'd bought and read up on how much…