wild flower mix, too late?

wild flower mix, too late?

I have a wild flower mix that I bought last year, planted out front in an unused tree box (DC's space for planting trees next to the road). They worked out great. I have maybe 1/3 of the can left. Is it too late to plant what's left for this year? The directions say to plant once the ground has reached a certain temperature, which I'm sure it did quite some time ago. I just haven't had time. It's only one of those Home Depot wild flower mixes. I live in DC, since I know thats the determining factor in answering my question. Thanks :)
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