Native Plant of the Month: Purple Passionflower

• The Purple Passionflower (Passiflora incarnata) is a fast-growing, vining perennial native to Northern Virginia. Often found climbing along sunny fields, forest edges, and local garden trellises, this hardy vine continues to display its intricate, vibrant purple blooms through September while simultaneously ripening smooth, yellow-green egg-sized fruit. The plant is also widely known as the "maypop" because its ripe, hollow fruits make a loud pop sound when stepped on. Beyond its unique noise and tropical appearance, the fruit's sweet, edible pulp offers a tart flavor reminiscent of guava, while the vine itself serves as an essential larval host for native butterflies like the Gulf Fritillary.

Horticultural Tip of the Month: Planting

• September marks the true peak planting season in Northern Virginia, offering ideal conditions that often surpass spring for establishing trees, shrubs, perennials, and cool-weather crops. While summer's intense heat begins to wane, the soil retains plenty of warmth, encouraging deep root growth without forcing plants to stress over moisture loss. Warm soil combined with cooling, crisper air creates optimal conditions for roots to anchor firmly into the ground before winter arrives, giving spring-blooming perennials and cool-season vegetables like spinach, kale, and garlic a huge head start.

Invasive Plant of the Month: Spotted Knapweed

• Spotted knapweed is an aggressive, non-native plant that poses a serious threat to Northern Virginia's meadows, pastures, and roadside habitats. Recognized by its thistle-like purple blooms and dark, spotted flower bracts, this weed dominates local ecosystems by competing with native flora for light, water, and soil nutrients. Beyond its fast growth and high seed output, spotted knapweed engages in chemical warfare known as allelopathy: its roots secrete toxic chemical compounds directly into the surrounding soil, inhibiting the germination and growth of neighboring plants. Spotted knapweed degrades wildlife habitat, reduces foraging quality for grazing animals, and increases soil erosion due to its shallow taproot system.

Native Plant of the Month: Fox Grape

• Fox grape (Vitis labrusca) is a hardy, woody vine native to NoVA, where it thrives along forest edges, stream banks, and sunny thickets throughout the region. Its broad, heart-shaped leaves and clusters of dark purple berries are a common sight along local nature trails as summer turns to autumn. A fun fact about the fox grape is that its distinctively sweet and musky flavor profile was cultivated to create the iconic Concord grape, making this native wild species the direct ancestor of classic grape jelly, juice, and traditionally "grape-flavored" sweets.

Horticultural Tip of the Month: Perennial Prep

• August is too warm to plant spring-flowering bulbs like tulips and daffodils, but it serves as the critical setup month for preparing soil beds with compost ahead of the autumn planting season. It is also the ideal window to dig up and divide overcrowded spring bulbs or iris rhizomes while they are fully dormant, as well as plant fall-blooming bulbs like autumn crocus for quick late-season blooms. Autumn crocuses planted during this month will bloom in just a few weeks without any leaves at all, and their foliage won't show up until the following spring.

Invasive Plant of the Month: Porcelain Berry

• Porcelain berry is a highly invasive, fast-growing deciduous vine that poses a major threat to native habitats in NoVA by aggressively climbing and smothering trees, shrubs, and native plant understories. Originally introduced from East Asia as an ornamental landscape plant, it thrives in urban, suburban, and edge environments across the region, where its vigorous growth blocks sunlight and weighs down native vegetation until entire canopies collapse. Its fruit clusters look like miniature, hand-painted ceramic beads, transitioning through a striking palette of pastel colors.