Bees. A thread.
We all know that honey bees are under threat, right? Bees and insects in general, but honey bees are a particular problem, as we rely on them so much. Want to help honey bees? Here’s some stuff that might help

First of all - STOP USING PESTICIDES! They don’t discriminate between aphids etc and bees. Plus, bees can feed on the honeydew aphids produce, so if you spray aphids you’ll kill bees.

Moving on to diet - bees are under attack from varroa mite and, just like humans they have more disease resistance if they have a varied diet. So they’ll suffer if they live in a monoculture of just one flower. Plant a variety of stuff

Also like humans, bees like their food to attract them. They like white, yellow, blue, purple and some orange in their diet. Red looks black (unattractive) to them, so plant a white variety of a plant over a red one.

They’ve evolved to be a certain size, so they can’t feed on every nectar producing plant out there. They don’t need native plants, but they do need simple, short, flowers. So this is good (verbena bonariensis)

This is not good for bees - bred so petals hide the nectar (if it still produces any) and red. Flowers bred to be attractive to humans aren’t always good for honey bees.

But you’ve seen butterflies and bumbles feeding on such flowers? They are bigger/have a longer proboscis and can feed on things honey bees can’t. Still plant for bumbles etc, obvs, just don’t forget honey bees

Honey bees have a whole colony to feed, so they minimise flying time and concentrate on one kind of flower at a time (which is why they are top pollinators, going from apple tree to apple tree and not distracted by dandelions). This means planting in bulk helps

Having just one of each kind of plant doesn’t usually help them, unless that plant produces massive amounts of flowers. I have 2 plants in that category - an oregano that has grown huge and is allowed to flower, and a creeping alpine. Small doesn’t necessarily mean useless

Bees eat year round. Yes, they store honey for winter but they’ll fly to forage if temperatures are high enough, so plant for a long season of flowering, a succession of plants

There are some things that are toxic to bees (inc privet and rhododendrons). They shouldn’t be foolish enough to feed on them, but if you know you have a colony nearby don’t be a dick and surround them with a sea of toxic stuff and nothing else

TL;DR - long season, variety of diet, plant in enough bulk, whites and blue spectrum good, red and complicated not so good, easy on the privet etc and NO PESTICIDES!

BTW, if you want to encourage natural predators to keep your aphids down then you have to accept you'll never have 0% aphids. Why? Because as soon as you have none your predators move elsewhere, because they need to eat. So aim to keep them minimal, not totally gone.