Plans and features
Every account is on a plan, and some features come with a given plan and those above it. A higher plan includes everything a lower one has. Pricing lists what each plan includes.
What if a feature is not there?
A feature that comes with a higher plan is shown, greyed out, with one line saying which plan has it and a link to pricing — so you learn it exists by meeting it, rather than hunting for something that has quietly disappeared.
A few things are never limited by plan: restoring a checkpoint, sharing a garden for viewing, cancelling, replacing a card, and contacting support. If something you expected is missing altogether, check your plan on your account page.
If your plan changes
Nothing you have already made goes away. A garden stays yours, and stays readable, whatever plan you are on — losing a feature stops you doing something new, it does not take back what you have already done.
The same goes for sharing: people you have already given access to keep it.