If you have good loamy soil, use a mulch on the bed to conserve moisture, are growing plants with reasonable water needs (not bog plants or "water hogs") live in a moderate summer climate (not the deep south), and your plants are established (not recently planted), then once a week is probably fine.
It's actually preferable to frequent watering, which can promote shallow roots. If once a week is working for your grass, it will probably be sufficient for your flowers.
If, on the other hand, you have sandy soil, don't use a mulch, and live in a blazing hot climate with the flower bed in full sun, you will need to water more often. You can gain a feel for what's needed in your particular situation by checking the soil moisture a few inches down every so often, and by observing how well your plants grow.
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