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While planting them a month or so ago may have been better, you can still sow your cleome seeds now. I would sow them directly in the garden. Cooler weather prevents them from germinating, so at least the warmer June temps should help them along. Just keep the area moist. Here is more information on growing these plants: https://www.gardeningknowhow.com/ornamental/flowers/cleome/growing-cleomes.htm

Cleomes are considered a tender perennial.
They are hardy to zones 4-11 and will reseed in zones 8-11.
Many people grow them as an annual.

Appears to be a Cleome flower.

https://www.gardeningknowhow.com/ornamental/flowers/cleome/growing-cleomes.htm

This will not work with Cleomes. You can stake the plants to ensure they stay upright.

https://www.gardeningknowhow.com/ornamental/flowers/cleome/growing-cleomes.htm

If the seed pods are ripe (yellow) harvest seed or allow the plant to release the seed. Handle the pods carefully as they explode when ripe, flinging the seed several feet away. It will self-sow but plants don't always come up where you want them. The plant itself will not survive winter in Mass. If you have a hybrid Cleome, the seeds do not reliably produce the same colors as the parent plant. After several generations/years of self-sowing, all the flowers may end up the standard pinkish-white color. I would cut the plant down to the ground and let the roots compost in the soil or pull the entire plant for the compost pile.