Can I use Heirloom to plan a garden that feeds my family?

Yes: plan it like a small market garden, and see week by week what your beds should put on the table, so the gaps show up on screen before they show up in the kitchen.

At setup, say whether you grow today or are just starting: either way you get the whole app. Answer Yes to the standard bed question to plan in beds, then use successions for the salad greens and roots you want every week.

Give each planting its expected yield, and Season Harvests shows what the garden should give, crop by crop, week by week. For a weekly picking list in Weekly harvests, create a sales channel for your household.

See Set up your farm and Set up your sales channels.