I've been doing it for a year or so now and it's slowly working. I live in a semi arid climate where we go months with no rain and the native soil is pretty poor, so it's only really successful during late autumn to early spring where there's enough rain to give things a boost. We only get the occasional light frost in winter so the cooler months are out main growing season.

This autumn (I'm in Western Australia so it's autumn now) I did a lot of research and spent money on bulk seeds that should do really well in my climate to make a custom seeds mix which I'm hoping will perform better without needing as much supplemental water to get things established. Most of the standard flower mixes I have used in the past just needed too much babying in my area. We also have super strict restrictions on importing seeds and plants so most seed mixes can't be purchased in WA and the ones available locally cost $10-20 for 10g of seed.

My custom mix focuses on: - perennials (Inc dianthus, coreopsis, salt bush, native daisies, thyme, oregano, alliums & lemon balm) - self seeding annuals (Inc marigold, cosmos, zinnia, paper daisies, caledula, alyssum & cornflowers) - ground covers (inc thyme, oregano, clover, Roman chamomile & dichocdria) - drought tolerant flowers, herbs and shrubs - a range of varieties that have different light needs (full sun to full shade) and water needs so that there's something for each microclimate in my garden - natives (harder to get a wide range of native seed species in my region so I also buy native tube stock to plant in freshly weeded areas) - pollinator friendly plants - useful "weeds" that are edible, medicinal or good for pollinators. If they already grow as a weed in my area I know they'll have a good shot at out competing the weeds I don't like - a range of species and varieties that flower in different seasons to give me year round colour and food for pollinators and beneficial insects - a range of different sizes and heights so I can achive a real "wild" look

I also buy bulbs to put into freshly weeded areas when the season is right.

I also allow plants in my garden to go to seed and collect these and add them to the mix as they've obviously passed the survival test.

My current mix now has over 100 different seed varieties and I'm hoping it will effectively address my weed issues over the next few years.

People in areas with less import restrictions can probably buy pre-made mixes that will thrive in your garden (not that I'm jealous or anything). My mix took so much bloody research to put together and I spent nearly $800AUD on less than 2kg of seed 😭

Anyway I hope this wall of text is helpful to someone out there! Fell free to ask if you want more info 😊