Start with the thing that stops more everyday Herndon orders than traffic: 20172 is post-office boxes. If the address you have ends in that ZIP, nobody can deliver flowers to it, and you need a street address instead. The other two are real places with different characters. 20170 is the town — four and a bit square miles of it, walkable, with the 1857 railway depot still standing on Station Street and the W&OD Trail running past it through the middle of downtown. A just-because delivery here is genuinely quick: Bundleofroses at 763 Elden Street is inside the town limits, Herndon Florist is 1.3 miles up Reston Parkway and Reston Floral 2.1 miles away on South Lakes Drive, so a bouquet ordered at eleven can be on a porch on Monroe or Locust Street by mid-afternoon without anybody getting on the toll road. 20171 is the larger, looser half — mostly unincorporated Fairfax County south and west of the Dulles Toll Road, addressed as Herndon but laid out as subdivisions: Oak Hill, Floris, Franklin Farm, McNair Farms, Fox Mill, the streets running out toward West Ox Road and Route 28. Those deliveries want a little more from you — the building letter if it is a townhouse cluster, the gate or callbox code, a line about where visitor parking is — because the courts are shared and a driver who cannot park will not leave a vase in a fire lane. The apartment blocks along Elden Street, Herndon Parkway and around Worldgate are the easiest of all if you say so in the notes: the leasing office or the package room will take it indoors and it will be waiting rather than wilting. And inside the town, Kingstream, Chandon and Hiddenbrook are straightforward driveway-and-doorstep routes.
Two last things about sending flowers here for no reason. The first is the season, because Virginia gives the shops very different material across the year and a just-because order is the one place you can let that decide the bouquet. In February and March what is good is imported and structural — roses, tulips, ranunculus, anemone. From April into June the local material arrives and a garden-style hand-tied is at its best; by August the heat has thinned what grows nearby, and the reliable choices are the sturdier tropicals and anything built to sit in air conditioning. Autumn brings the dahlias and the branch material that make the best table arrangements of the year. If you have no occasion dictating a color, say *whatever is best today* in the order notes and let the designer choose; shops on this grid consistently do their strongest work when they are not matching a photograph. The second is the note. On a birthday or an anniversary the card writes itself, and on a just-because order it is the entire message — the flowers only explain that you meant it. Two or three specific sentences about the actual thing you are acknowledging, hand-written by the shop at no charge, is what makes the difference between a delivery and a gesture. And if the recipient is someone who would be embarrassed by a fuss at work, send it to the house: in a town this size, a bouquet carried through a Worldgate lobby is a story by lunchtime.