“The city wasn’t doing anything with it, and I had a bunch of extra plants,” says Scott, as we tour the garden, cars whooshing by on both sides of Loynes Drive.

Scott is a guerrilla gardener, a member of a burgeoning movement of green enthusiasts who plant without approval on land that’s not theirs. In London, Berlin, Miami, San Francisco and Southern California, these free-range tillers are sowing a new kind of flower power. In nighttime planting parties or solo “seed bombing” runs, they aim to turn neglected public space and vacant lots into floral or food outposts.

Part beautification, part eco-activism, part social outlet, the activity has been fueled by Internet gardening blogs and sites such as GuerrillaGardening.org, where before-and-after photos of the latest “troop digs” inspire 45,000 visitors a month to make derelict soil bloom.

At a time of shrinking city budgets and skeletal landscaping staffs, it’s a hint at where guerrilla gardening could go to approved brigades of citizen gardeners helping cities turn wasted space into food and flowers. After years of looking over his shoulder, Scott can come in out of the cold dawn plantings.