The first question at a windowsill is whether it is a growing place or simply a convenient shelf. Watch the actual spot where the leaves would sit: when does direct sun reach it, what blocks the glass, and does that change with the season? A compass direction alone cannot answer. A shaded south-facing window in the northern hemisphere may give less useful light than an unobstructed window with another orientation; in the southern hemisphere the direction of stronger sun reverses.
Check the sill before buying the plants
Look at the window at several times of day. Curtains, neighboring buildings and deep overhangs matter. Note whether a radiator dries the pot, cold glass touches the leaves, or opening the window sends a draft across it. Maryland Extension recommends a sunny position, drainage and protection from temperature extremes for indoor herbs. Its south-or-west window advice describes Maryland; use the light and temperature at your own window, not the compass label alone.
Measure the usable space too. A narrow sill may hold one stable pot with a saucer, not a long row of plants. The pot must not be balanced where it can fall when the window opens. Keep leaves clear of cold panes and allow room to remove each pot for watering and inspection. A shelf just beside the glass can be a better location if the sill is unsafe, but the light there may differ: check the leaves' position, not just the room.
Match the herb to the conditions you found
If the sill stays bright and warm, basil is a reasonable first trial. Thyme or oregano may suit that light too, in separate pots that dry more between waterings. If the light is less intense, chives or mint may be worth trying, but “tolerates some shade” is not a promise of a useful indoor harvest. Maryland Extension describes chives and mint as herbs that can grow in light shade, while also noting that most herbs prefer substantial sun. Weak, elongated new growth is a reason to reconsider the location or add appropriate supplemental light.
Parsley can be useful where the window stays reasonably bright but less warm than basil would prefer. Rosemary is less forgiving of persistently damp roots and dim indoor conditions; it is a poor choice for a first trial on a cool, shaded sill. RHS notes that cilantro can be short-lived on a windowsill, becoming pale in poor light or flowering early, so do not plan on one pot supplying leaves indefinitely. These are selection cautions, not rankings from a trial in this kitchen.
Give each herb a pot with a drainage hole and a saucer. Lift the pot and check its mix before watering; heat at the glass can speed drying, while a cooler season can slow it. Maryland Extension separates the moisture needs of basil, mint and parsley from those of thyme and oregano. One watering calendar for the whole sill hides that difference. Do not leave the roots standing in runoff.
Decide whether the window is enough
Start with one or two herbs and watch the newest growth after a few harvests. If it stays thin and reaches strongly toward the glass, compare light at the leaf position with a brighter place; the indoor light guide shows what else to check. If the window cannot provide the light an herb needs, choose a suitable grow light or buy cut herbs when needed. Neither choice is a failure of the windowsill.
For the differences between basil, chives, mint and the drier-rooted herbs, use the indoor herb selection guide. This page is about the physical window: its light, temperature, available space and drainage. Those conditions decide what is plausible long before a plant label calls an herb “easy.”
A useful trial can be small: put one herb in the intended position and photograph its newest growth each week. If it produces sturdy leaves and you can harvest modestly without emptying the plant, the spot is doing useful work. If new stems stretch or production slows sharply, do not fill the rest of the sill with copies of the same plant. Recheck seasonal shade and temperature first; the window that worked in summer may be a different growing place in winter.
