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Plant tags use three categories and they are not suggestions. Full sun means six or more hours of direct, unfiltered sun. Part shade means roughly three to six hours, ideally morning sun. Full shade means under three hours of direct sun, though most shade plants still need bright indirect light to bloom at all.

The cheapest way to measure this is to photograph the same spot at 9am, noon, 3pm and 6pm on a clear day and count the hours it is actually in direct sun. Do it in the season you plan to plant — a bed that reads as full sun in April can be in deep shade by July once the trees leaf out. This one mistake is responsible for more dead perennials than any pest or disease.

Your USDA hardiness zone tells you the average annual minimum winter temperature in your area, which determines what will survive the winter. It does not tell you about summer heat, humidity, rainfall, or how long your growing season is — all of which matter just as much.

A practical rule: buy perennials rated at least one zone colder than yours. If you are in zone 6b, plants rated to zone 5 will shrug off a bad winter that kills a zone 6 plant outright. That single buffer is the difference between replanting every spring and building a garden that compounds year over year.

Dig a hole about a foot deep, fill it with water, and time how long it takes to drain. Under 15 minutes and your soil is sandy and will need organic matter to hold water and nutrients. Over four hours and you have a drainage problem — heavy clay, compaction, or both — and most perennials planted there will rot at the crown over winter.

The fix for both extremes is the same: two to three inches of compost worked into the top six to eight inches. For genuinely bad drainage, raised beds are a faster and more reliable answer than trying to amend clay into submission. A soil test through your county extension office also tells you your pH, which quietly determines whether the nutrients already in your soil are available to plants at all.

The reason professionally designed beds look full and amateur beds look sparse is layering. Work back to front: tall structural plants and shrubs at the back, mid-height perennials in the middle, low groundcover and edging plants at the front. Then repeat each grouping in odd numbers — threes and fives read as intentional, pairs read as accidental.

Space every plant according to its mature width, not its size in the pot. A new bed planted correctly looks sparse for two seasons and excellent forever after. A new bed planted for instant fullness looks great for one season and then becomes a crowded, disease-prone thicket you have to dig up and divide.

Two to three inches of shredded bark or leaf mulch suppresses weeds, moderates soil temperature and cuts water loss substantially. Keep it pulled back an inch or two from plant stems and tree trunks — mulch piled against bark holds moisture and invites rot.

For the first season, water new plantings deeply once or twice a week rather than lightly every day. Deep, infrequent watering pulls roots downward and builds drought tolerance. Frequent shallow watering trains roots to stay at the surface, which is exactly where the soil dries out first in August.