Milkwort flowering happens over fairly extended periods. The flowers open at the ends of branches, while older ones mature, develop seeds, and fall away. You won't see long spikes of flowers, but the stems get progressively longer and kind of gangly. Here's a field milkwort of a different color, and slightly more mature. You can see the lowest flowers and bracts withering, and below that are smaller bracts where the earliest flowers have already fallen away.